Add some scripts to fix up Qt's OS X binary packages.

You have to run macosx-support-lib-patches/qt-fix-pc-files manually,
telling it where Qt was installed, but so it goes....

Change-Id: I8668a1fc4254cc002aee068749edb3cf3bdb854f
Reviewed-on: https://code.wireshark.org/review/3215
Reviewed-by: Guy Harris <guy@alum.mit.edu>