Rebuild against QT 5.12.1 and updated to 5.11.3
Depends on D5284
Changelog:
- Fixed QByteArrat.at() and getitem() to return a byte with Python
- Updated the OpenGL examples to explicitly set a supported OpenGL
- Fixed a regression in the handling of signals with 'const char *'
- Renamed QRandomGenerator.global() to global_().
- Fixed the qmlscene and designer plugins to use the private copy of the sip module.