SSL: make CA filter code compatible with Qt 5.
mumble, murmur: add a 'Qt::escape' for Qt 5 to avoid ifdef hell.
3rdparty/fx11-build: remove DX_SDK include dir, we get it from the environment.

Fixes the build when using Qt 5.  Qt 5's qmake includes
an unquoted "C:\Program Files (x86)\[...]" in the Makefile,
causing the build to break.
OverlayEditorScene: fix header to allow building with Qt 5.
Messages: fix conversion from protobuf uint64 to ChanACL::Permissions when building against Qt 5.