Workaround for same problem as in https://github.com/Martchus/PKGBUILDs/issues/11 just for moc and rcc
* Fix StaticQt5::Test * Fix linking against static MariaDB
* 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