Use the internal libpq for universal builds

distro-configs/LibreOfficeLinux.conf

 --with-vendor=The Document Foundation
 --with-system-dicts
---with-system-postgresql
 --without-unix-wrapper
 --without-system-zlib
 --without-system-stdlibs
@@ -12,6 +11,7 @@
 --without-system-jpeg
 --without-system-jars
 --without-system-cairo
+--without-system-postgresql
 --without-openldap
 --without-junit
 --without-helppack-integration