Update Qt to 5.6.2 [1,2]
Thanks to the upstream work of Marie Loise Nolden, we could get rid of a handful
of patches, as they have been properly upstreamed. The rest of the work is just
some minor plist changes.
I would like to thank Loise <email@example.com> for the upstream work, and Adriaan
<firstname.lastname@example.org> for getting the update into shape.