Unify WarningFlags.cmake by checking if compiler supports warning flag #2382

Job	Run time
clickable (Debug, amd64, glew)	3m 21s
clickable (Debug, amd64, sdl)	3m 20s
clickable (Debug, armhf, glew)	3m 11s
clickable (Debug, armhf, sdl)	3m 9s
clickable (Release, amd64, glew)	3m 39s
clickable (Release, amd64, sdl)	3m 21s
clickable (Release, arm64, glew)	3m 43s
clickable (Release, arm64, sdl)	3m 21s
clickable (Release, armhf, glew)	3m 39s
clickable (Release, armhf, sdl)	3m 27s
	34m 11s

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