Revert "fix libpq location detection"

This reverts commit e2b1ee26.

src/mod/event_handlers/mod_cdr_pg_csv/Makefile.am

@@ -3,6 +3,6 @@ MODNAME=mod_cdr_pg_csv
 
 mod_LTLIBRARIES = mod_cdr_pg_csv.la
 mod_cdr_pg_csv_la_SOURCES  = mod_cdr_pg_csv.c
-mod_cdr_pg_csv_la_CFLAGS   = $(AM_CFLAGS) $(SWITCH_AM_CXXFLAGS) $(POSTGRESQL_CFLAGS)
+mod_cdr_pg_csv_la_CFLAGS   = $(AM_CFLAGS) $(SWITCH_AM_CXXFLAGS)
 mod_cdr_pg_csv_la_LIBADD   = $(switch_builddir)/libfreeswitch.la
-mod_cdr_pg_csv_la_LDFLAGS  = -avoid-version -module -no-undefined -shared $(SWITCH_AM_LDFLAGS) $(POSTGRESQL_LIBDIR) -lpq
+mod_cdr_pg_csv_la_LDFLAGS  = -avoid-version -module -no-undefined -shared -lpq $(SWITCH_AM_LDFLAGS)