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)