This header used to supply CPU capability constants and things like __ARM_MAX_ARCH__. The latter is now part of asm_base.h, automatically included by everything, and assembly files no longer do capability checks. The immediate motivation was that there were a few misspelled includes that used "openssl/arm_arch.h" instead of <openssl/arm_arch.h> (see https://boringssl-review.googlesource.com/c/boringssl/+/76247), but given we can just remove them anyway, may as well clear this out. This now also means we don't pollute another prefix in the global namespace (though external callers shouldn't have been using this header anyway). I've kept the header around, but a no-op, because some bindings libraries have explicitly listed the header and it's probably not worth the trouble to clear those out. Bug: 42290548 Change-Id: I24f36cd48b0e3b6498ecbdc70fecc36961a8b9fe Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/76248 Auto-Submit: David Benjamin <davidben@google.com> Reviewed-by: Bob Beck <bbe@google.com> Commit-Queue: Bob Beck <bbe@google.com>