Add deprecation warning for `-m` option #4883

Job	Run time
Build vars & Github release (if required)	8s
Build for Android .apk (artifact+codeQL)	30m 39s
Build for Linux .deb amd64 (artifacts+codeQL)	6m 34s
Build for MacOS (artifacts)	4m 31s
Build for MacOS Legacy (artifacts+CodeQL)	13m 21s
Build for Windows (artifact+codeQL)	22m 33s
Create files for .deb repository (if requested)	0s
	1h 17m 46s

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