Grab patch from upstream to fix the build.

One of the patches cherry picked to the 3.14 branch depends on a glib API
added in the 2.44 series. Add a patch from upstream to allow build with
glib 2.42 in ports.

PR: 201951 [1]
Reported by: Walter Schwarzenfeld, Gary <freebsd-bugzilla@in-addr.com> [1]
Obtained from: upstream gtk+ 3.14 branch