pgsql: Support "samehost" and "samenet" specifications in pg_hba.conf,

Log Message:
-----------
Support "samehost" and "samenet" specifications in pg_hba.conf,
by enumerating the machine's IP interfaces to look for a match.

Stef Walter

Modified Files:
--------------
    pgsql:
        configure (r1.656 -> r1.657)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/configure?r1=1.656&r2=1.657)
        configure.in (r1.611 -> r1.612)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/configure.in?r1=1.611&r2=1.612)
    pgsql/doc/src/sgml:
        client-auth.sgml (r1.123 -> r1.124)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/client-auth.sgml?r1=1.123&r2=1.124)
    pgsql/src/backend/libpq:
        hba.c (r1.190 -> r1.191)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/libpq/hba.c?r1=1.190&r2=1.191)
        ip.c (r1.47 -> r1.48)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/libpq/ip.c?r1=1.47&r2=1.48)
        pg_hba.conf.sample (r1.67 -> r1.68)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/libpq/pg_hba.conf.sample?r1=1.67&r2=1.68)
    pgsql/src/include/libpq:
        hba.h (r1.58 -> r1.59)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/libpq/hba.h?r1=1.58&r2=1.59)
        ip.h (r1.21 -> r1.22)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/libpq/ip.h?r1=1.21&r2=1.22)
    pgsql/src/include:
        pg_config.h.in (r1.142 -> r1.143)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/pg_config.h.in?r1=1.142&r2=1.143)
    pgsql/src/tools/msvc:
        Mkvcbuild.pm (r1.42 -> r1.43)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/tools/msvc/Mkvcbuild.pm?r1=1.42&r2=1.43)

Added Files:
-----------
    pgsql/src/tools/ifaddrs:
        Makefile (r1.1)

(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/tools/ifaddrs/Makefile?rev=1.1&content-type=text/x-cvsweb-markup)
        README (r1.1)

(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/tools/ifaddrs/README?rev=1.1&content-type=text/x-cvsweb-markup)
        test_ifaddrs.c (r1.1)

(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/tools/ifaddrs/test_ifaddrs.c?rev=1.1&content-type=text/x-cvsweb-markup)