Build MojoShader with MSL support #729

Job	Run time
Rocky Linux	1m 50s
FreeBSD	1m 21s
iOS/tvOS SDL3 (iOS, iphoneos, arm64)	46s
Rocky Linux MinGW	1m 14s
iOS/tvOS SDL3 (iOS, iphonesimulator, x86_64;arm64)	1m 1s
Rocky Linux MinGW SDL3	59s
iOS/tvOS SDL3 (tvOS, appletvos, arm64)	48s
Rocky Linux SDL3	1m 30s
macOS (x86_64)	33s
iOS/tvOS SDL3 (tvOS, appletvsimulator, x86_64;arm64)	1m 8s
macOS (Universal) SDL3	1m 11s
Windows (MSVC)	1m 23s
	13m 44s

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