This format is used by many Unity games, with D3D-enabled source reader.
-- v2: mfreadwrite/reader: Fixup MFVideoFormat_ABGR32 subtype to enumerate the video processor. winegstreamer: Support MFVideoFormat_ABGR32 output in the video processor. mfreadwrite/tests: Add tests with MFVideoFormat_ABGR32 output format. mf/tests: Add video processor tests with MFVideoFormat_ABGR32 format. mfplat: Add MFVideoFormat_ABGR32 format information.