Metal: fix crash by enabling concurrent compilation only if available #12311
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Bug: https://bugs.dolphin-emu.org/issues/13404
On macOS 13.6 / Intel Iris with Metal 2, when starting any game, Dolphin crashes immediately with this message:
It seems that even on macOS 13.3+, not all devices implement this selector (first implemented in #11911).
As the behavior is an optional optimization anyway, we now perform a dynamic detection to avoid crashing if the feature is not available.