Bug 509311 - Replace GtkSignalFunc with GCallback

GtkSignalFunc is gone in GTK3 and GGcallback is available in the min
GLib required.

Change-Id: If72db866935d1b0bb4b48c6abc93b2cc870822ca
Signed-off-by: Alexander Kurtakov <akurtako@redhat.com>
1 file changed