Don't try to enable Metal on older Macs #1588
Merged
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Metal was introduced in OS X 10.11 El Capitan, so the framework doesn't exist on older Apple systems. Instead of trying to unconditionally use it on Apple devices, check for the framework first.
Note: Metal still only works with the Xcode project generator, and not with Makefiles/Ninja because CMake doesn't yet know how to handle the metal shaders.