Revert "fix bug#605156 by ordering libtool archives that may pull in system"

This reverts commit e14bdeba.  While
that commit fixed things in some cases, it broke others.  I think the
problem people are running into here that we actually need the library
path order to be:

.:$BUILD_ROOT:/usr

Ensure that the middle happens by explicitly calling pkg-config.

https://bugzilla.gnome.org/show_bug.cgi?id=605156