Add direct wxQT implementation of wxBitmap::Create(int, int, wxDC&) needed in wxAuiTabContainer::Render for retina support (not using the dc, see svn r76601 r74294)
Add generic wxTextMeasure to wxQT QT_LOWLEVEL_SRC bakefile section (and regenerate build files) to fix error: reference to 'vtable for wxTextMeasure' not defined
Add wxQtEventLoopSourcesManager stub implementation to fix wxQT linking error: reference to 'wxGUIAppTraits::GetEventLoopSourcesManager()' not defined (see svn r74477 and #15305)