Merge pull request #858 from MediaArea/windows #756

Job	Run time
build-macos-no-brew-Qt6 (clang-9)	7m 9s
build-linux (gcc-9)	7m 52s
build-macos-no-brew (clang-9)	7m 43s
build-macos-brew (clang-9)	2m 54s
build-macos-brew-Qt6 (clang-9)	3m 47s
build-linux-Qt6 (gcc-9)	8m 25s
build-windows-mingw (5.15.*)	9m 43s
build-windows-mingw-Qt6 (6.3.0, qtmultimedia qt5compat)	11m 21s
build-windows-vs (5.15.*)	8m 24s
build-windows-vs-Qt6 (6.3.0, qtmultimedia qt5compat)	13m 25s
	1h 20m 43s

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