Actually look in /usr/share/gtk-2.0 for default rc files

I managed to forget the 'share' component of the path.
Support automake 1.14

https://bugzilla.gnome.org/show_bug.cgi?id=709293
Fix build
Merge branch 'gtk-2-24' of git://git.gnome.org/gtk+ into gtk-2-24
JOHNE - Preliminary stuff for generating pkg-config files. Will probably get supplemented depending upon feedback from Todd