Update Mac Legacy from Qt 5.9.9 to 5.15.2 #4322

Job	Run time
Build vars & Github release (if required)	7s
Build for Android .apk (artifact+codeQL)	18m 54s
Build for Linux .deb amd64 (artifacts+codeQL)	6m 26s
Build for Linux .deb armhf (artifacts)	4m 0s
Build for Linux .deb arm64 (artifacts)	3m 38s
Build for MacOS (artifacts)	20m 7s
Build for MacOS Legacy (artifacts+CodeQL)	12m 52s
Build for iOS (artifacts)	7m 55s
Build for Windows (artifact+codeQL)	21m 11s
Build for Windows JACK (artifact)	8m 34s
Create files for .deb repository (if requested)	0s
	1h 43m 44s

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