Merge pull request #819 from MediaArea/build #706

Job	Run time
build-macos-brew-Qt6 (clang-9)	3m 6s
build-macos-brew (clang-9)	2m 59s
build-macos-no-brew-Qt6 (clang-9)	5m 10s
build-macos-no-brew (clang-9)	5m 36s
build-linux (gcc-9)	7m 43s
build-linux-Qt6 (gcc-9)	8m 39s
build-windows-mingw (5.15.*)	9m 56s
build-windows-mingw-Qt6 (6.3.0, qtmultimedia qt5compat)	12m 13s
build-windows-vs-Qt6 (6.3.0, qtmultimedia qt5compat)	12m 55s
build-windows-vs (5.15.*)	8m 6s
	1h 16m 23s

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