As suggested by njtaylor0101 [AT] gmail.com: we (always) check for the gthread
module when checking glib so there's no need to check for it when checking GTK.
This prevents us, when configuring with gtk3, for checking for gthread-2.0
version 3.0.0 or later.
svn path=/trunk/; revision=40684
Check if a development file for the package is present and install
the corresponding m4 file in aclocal-missing if it isn't.
Add glib, glib-2.0 and gtk-2.0 to the fallback directory.
svn path=/trunk/; revision=6102
Jeff Morriss