pgsql: Split the LDFLAGS make variable into two parts: LDFLAGS is now

Log Message:
-----------
Split the LDFLAGS make variable into two parts: LDFLAGS is now used for
linking both executables and shared libraries, and we add on LDFLAGS_EX when
linking executables or LDFLAGS_SL when linking shared libraries.  This
provides a significantly cleaner way of dealing with link-time switches than
the former behavior.  Also, make sure that the various platform-specific
%.so: %.o rules incorporate LDFLAGS and LDFLAGS_SL; most of them missed that
before.  (I did not add these variables for the platforms that invoke $(LD)
directly, however.  It's not clear if we can do that safely, since for the
most part we assume these variables use CC command-line syntax.)

Per gripe from Aaron Swenson and subsequent investigation.

Modified Files:
--------------
    pgsql:
        configure (r1.682 -> r1.683)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/configure?r1=1.682&r2=1.683)
        configure.in (r1.630 -> r1.631)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/configure.in?r1=1.630&r2=1.631)
    pgsql/doc/src/sgml:
        installation.sgml (r1.347 -> r1.348)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/installation.sgml?r1=1.347&r2=1.348)
    pgsql/doc/src/sgml/ref:
        pg_config-ref.sgml (r1.29 -> r1.30)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/pg_config-ref.sgml?r1=1.29&r2=1.30)
    pgsql/src:
        Makefile.global.in (r1.262 -> r1.263)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/Makefile.global.in?r1=1.262&r2=1.263)
        Makefile.shlib (r1.123 -> r1.124)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/Makefile.shlib?r1=1.123&r2=1.124)
    pgsql/src/backend:
        Makefile (r1.144 -> r1.145)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/Makefile?r1=1.144&r2=1.145)
    pgsql/src/backend/port:
        Makefile (r1.27 -> r1.28)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/port/Makefile?r1=1.27&r2=1.28)
    pgsql/src/bin/initdb:
        Makefile (r1.60 -> r1.61)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/initdb/Makefile?r1=1.60&r2=1.61)
    pgsql/src/bin/pg_config:
        Makefile (r1.24 -> r1.25)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_config/Makefile?r1=1.24&r2=1.25)
        pg_config.c (r1.32 -> r1.33)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_config/pg_config.c?r1=1.32&r2=1.33)
    pgsql/src/bin/pg_controldata:
        Makefile (r1.21 -> r1.22)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_controldata/Makefile?r1=1.21&r2=1.22)
    pgsql/src/bin/pg_ctl:
        Makefile (r1.29 -> r1.30)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_ctl/Makefile?r1=1.29&r2=1.30)
    pgsql/src/bin/pg_dump:
        Makefile (r1.70 -> r1.71)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_dump/Makefile?r1=1.70&r2=1.71)
    pgsql/src/bin/pg_resetxlog:
        Makefile (r1.23 -> r1.24)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_resetxlog/Makefile?r1=1.23&r2=1.24)
    pgsql/src/bin/psql:
        Makefile (r1.69 -> r1.70)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/Makefile?r1=1.69&r2=1.70)
    pgsql/src/bin/scripts:
        Makefile (r1.45 -> r1.46)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/scripts/Makefile?r1=1.45&r2=1.46)
    pgsql/src/interfaces/ecpg/preproc:
        Makefile (r1.149 -> r1.150)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/preproc/Makefile?r1=1.149&r2=1.150)
    pgsql/src/interfaces/ecpg/test:
        Makefile (r1.78 -> r1.79)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/Makefile?r1=1.78&r2=1.79)
        Makefile.regress (r1.8 -> r1.9)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/Makefile.regress?r1=1.8&r2=1.9)
    pgsql/src/makefiles:
        Makefile.aix (r1.29 -> r1.30)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/makefiles/Makefile.aix?r1=1.29&r2=1.30)
        Makefile.bsdi (r1.21 -> r1.22)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/makefiles/Makefile.bsdi?r1=1.21&r2=1.22)
        Makefile.cygwin (r1.13 -> r1.14)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/makefiles/Makefile.cygwin?r1=1.13&r2=1.14)
        Makefile.darwin (r1.11 -> r1.12)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/makefiles/Makefile.darwin?r1=1.11&r2=1.12)
        Makefile.dgux (r1.3 -> r1.4)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/makefiles/Makefile.dgux?r1=1.3&r2=1.4)
        Makefile.freebsd (r1.25 -> r1.26)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/makefiles/Makefile.freebsd?r1=1.25&r2=1.26)
        Makefile.hpux (r1.31 -> r1.32)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/makefiles/Makefile.hpux?r1=1.31&r2=1.32)
        Makefile.irix (r1.6 -> r1.7)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/makefiles/Makefile.irix?r1=1.6&r2=1.7)
        Makefile.linux (r1.25 -> r1.26)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/makefiles/Makefile.linux?r1=1.25&r2=1.26)
        Makefile.netbsd (r1.15 -> r1.16)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/makefiles/Makefile.netbsd?r1=1.15&r2=1.16)
        Makefile.openbsd (r1.15 -> r1.16)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/makefiles/Makefile.openbsd?r1=1.15&r2=1.16)
        Makefile.osf (r1.8 -> r1.9)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/makefiles/Makefile.osf?r1=1.8&r2=1.9)
        Makefile.sco (r1.12 -> r1.13)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/makefiles/Makefile.sco?r1=1.12&r2=1.13)
        Makefile.solaris (r1.14 -> r1.15)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/makefiles/Makefile.solaris?r1=1.14&r2=1.15)
        Makefile.sunos4 (r1.7 -> r1.8)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/makefiles/Makefile.sunos4?r1=1.7&r2=1.8)
        Makefile.svr4 (r1.5 -> r1.6)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/makefiles/Makefile.svr4?r1=1.5&r2=1.6)
        Makefile.ultrix4 (r1.7 -> r1.8)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/makefiles/Makefile.ultrix4?r1=1.7&r2=1.8)
        Makefile.univel (r1.5 -> r1.6)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/makefiles/Makefile.univel?r1=1.5&r2=1.6)
        Makefile.unixware (r1.23 -> r1.24)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/makefiles/Makefile.unixware?r1=1.23&r2=1.24)
        Makefile.win32 (r1.15 -> r1.16)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/makefiles/Makefile.win32?r1=1.15&r2=1.16)
        pgxs.mk (r1.19 -> r1.20)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/makefiles/pgxs.mk?r1=1.19&r2=1.20)
    pgsql/src/template:
        cygwin (r1.7 -> r1.8)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/template/cygwin?r1=1.7&r2=1.8)
        win32 (r1.3 -> r1.4)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/template/win32?r1=1.3&r2=1.4)
    pgsql/src/test/regress:
        GNUmakefile (r1.82 -> r1.83)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/GNUmakefile?r1=1.82&r2=1.83)
    pgsql/src/test/thread:
        Makefile (r1.6 -> r1.7)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/thread/Makefile?r1=1.6&r2=1.7)
    pgsql/src/timezone:
        Makefile (r1.32 -> r1.33)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/timezone/Makefile?r1=1.32&r2=1.33)
    pgsql/src/tools/findoidjoins:
        Makefile (r1.7 -> r1.8)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/tools/findoidjoins/Makefile?r1=1.7&r2=1.8)
    pgsql/src/tools/fsync:
        Makefile (r1.8 -> r1.9)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/tools/fsync/Makefile?r1=1.8&r2=1.9)
    pgsql/src/tools/ifaddrs:
        Makefile (r1.2 -> r1.3)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/tools/ifaddrs/Makefile?r1=1.2&r2=1.3)