* Adapt hacks to new config system
* Use distinct mkspec mingw-w64-g++ rather than
patching the existing win32-g++
* Testing QML and ANGLE is on TODO list
because it hasn't been tested since quite a time
- patched ANGLE to be usable with Qt WebKit
- patched Qt WebKit to work with latest ANGLE
- removed unused patches
- fixed dependencies of mingw-w64-qt5-activeqt