xcb_popcount: Use __builtin_popcount if compiler supports it
If the compiler knows of a better implementation for counting the number of bits set in a word for the target CPU, let it use that, instead of the classic algorithm optimized for PDP-6.
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If the compiler knows of a better implementation for counting the number of bits set in a word for the target CPU, let it use that, instead of the classic algorithm optimized for PDP-6.