* gnu/packages/gnome.scm (gtkglext): New variable. * gnu/packages/patches/gtkglext-disable-disable-deprecated.patch, gnu/packages/patches/gtkglext-remove-pangox-dependency.patch: New files. * gnu-system.am (dist_patch_DATA): Add them. Signed-off-by: Ludovic Courtès <ludo@gnu.org>