MojoShader update for MSL PointSize support #29

Job	Run time
Rocky Linux MinGW	1m 18s
FreeBSD	1m 12s
iOS/tvOS SDL3 (iOS, iphoneos, arm64)	51s
Rocky Linux	1m 39s
Rocky Linux MinGW SDL3	1m 13s
iOS/tvOS SDL3 (iOS, iphonesimulator, x86_64;arm64)	1m 1s
Rocky Linux SDL3	1m 24s
iOS/tvOS SDL3 (tvOS, appletvos, arm64)	46s
iOS/tvOS SDL3 (tvOS, appletvsimulator, x86_64;arm64)	1m 27s
macOS (x86_64)	32s
macOS (Universal) SDL3	1m 18s
Windows (MSVC)	52s
	13m 33s

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