This test just doesn't want to work on MSW buildbot slaves even though it
works perfectly locally. No idea why but disable it when running on a build
bot slave for now to let the entire test suite pass.
Also add a comment explaining why the test is disabled for wxGTK.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@65705 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775