The signal callbacks in the ‘builder’ testcase have wrong prototypes.
This causes it to fail the “/Builder/Signal Autoconnect” test on
powerpc64le-linux.
Solve the problem by backporting the upstream fix that was applied to
GTK+ 3.0.
* gnu/packages/patches/gtk2-fix-builder-test.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/gtk.scm (gtk+-2): Use it.
Signed-off-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>
