Added macos check to SDL_Metal_DestroyView call #487

Job	Run time
build linux pkg-config	1m 36s
build vcpkg (macos-latest)	3m 23s
build bundled (macos-latest)	2m 28s
build vcpkg (ubuntu-latest)	6m 38s
build bundled (ubuntu-latest)	2m 15s
build vcpkg (windows-latest)	7m 53s
build bundled (windows-latest)	5m 54s
build bundled (--release, macos-latest)	2m 0s
build bundled (--release, ubuntu-latest)	2m 20s
build bundled (--release, windows-latest)	5m 6s
build bundled (static-link, macos-latest)	3m 7s
build bundled (static-link, ubuntu-latest)	2m 23s
build bundled (static-link, windows-latest)	6m 1s
build bundled (static-link, --release, macos-latest)	2m 32s
build bundled (static-link, --release, ubuntu-latest)	2m 12s
build bundled (static-link, --release, windows-latest)	6m 20s
	1h 2m 8s

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