Merge branch 'explicitly-no-alpha' into 'master'

Ask for zero alpha bits for the CS

Closes #8270

See merge request OpenMW/openmw!4842

apps/opencs/main.cpp

@@ -35,6 +35,7 @@ void setQSurfaceFormat()
     format.setSamples(ds->getMultiSamples());
     format.setStencilBufferSize(ds->getMinimumNumStencilBits());
     format.setSwapBehavior(QSurfaceFormat::DoubleBuffer);
+    format.setAlphaBufferSize(0);
     QSurfaceFormat::setDefaultFormat(format);
 }