gtk+: add patch to resolve crash
gtk+: add patch to resolve crash

There are several invalid object checks in the quartz backend that
cause a crash on OS X 10.11. This crash can be reproduced by running
gtk-demo and double-clicking on "Clipboard" in the list.

The patch is an adaption of a patch for gtk+3 from an upstream
developer.

Closes #44526.

Signed-off-by: Dominyk Tiller <53e438f55903875d07efdd98a8aaf887e7208dd3@gmail.com>

kwilczynski/homebrew,kwilczynski/homebrew,kwilczynski/homebrew,kwilczynski/homebrew