pgsql: Revise OpenLDAP configuration and linking to work on more

Log Message:
-----------
Revise OpenLDAP configuration and linking to work on more platforms
than before.  Albe Laurenz (but editorialized heavily by me, so if it
doesn't work it's my fault).

Modified Files:
--------------
    pgsql:
        configure (r1.503 -> r1.504)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/configure.diff?r1=1.503&r2=1.504)
        configure.in (r1.473 -> r1.474)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/configure.in.diff?r1=1.473&r2=1.474)
    pgsql/src:
        Makefile.global.in (r1.226 -> r1.227)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/Makefile.global.in.diff?r1=1.226&r2=1.227)
    pgsql/src/backend:
        Makefile (r1.118 -> r1.119)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/Makefile.diff?r1=1.118&r2=1.119)
    pgsql/src/include:
        pg_config.h.in (r1.99 -> r1.100)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/pg_config.h.in.diff?r1=1.99&r2=1.100)
    pgsql/src/interfaces/libpq:
        Makefile (r1.147 -> r1.148)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/libpq/Makefile.diff?r1=1.147&r2=1.148)