cpp(1) only understand integer arithmetical expressions, so _MACHINE == i386 test always succeeds, even on non-i386 (both sides of expressions become 0).  Remove the comment since _MACHINE and _MACHINE_ARCH are going away.
cpp(1) only understand integer arithmetical expressions, so
_MACHINE == i386 test always succeeds, even on non-i386 (both
sides of expressions become 0).  Remove the comment since
_MACHINE and _MACHINE_ARCH are going away.

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