Feature flag: C/C++ overlay #7393

Job	Run time
Ruby analysis (macos-latest, nightly-latest)	1m 12s
Ruby analysis (ubuntu-latest, default)	43s
Ruby analysis (macos-latest, default)	50s
Ruby analysis (macos-latest, linked)	1m 9s
Ruby analysis (ubuntu-latest, nightly-latest)	51s
Ruby analysis (ubuntu-latest, linked)	49s
	5m 34s

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