Add deprecation warning for `-m` option #4882

Job	Run time
Build vars & Github release (if required)	11s
Build for Android .apk (artifact+codeQL)	31m 18s
Build for Linux .deb amd64 (artifacts+codeQL)	6m 17s
Build for MacOS (artifacts)	4m 35s
Build for MacOS Legacy (artifacts+CodeQL)	14m 23s
Build for Windows (artifact+codeQL)	20m 58s
Create files for .deb repository (if requested)	0s
	1h 17m 42s

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