am 12006013: fixedfft: Only includes cpu-features.h when __arm__ is defined.

Merge commit '12006013cc2cd0a076855ed068f5f782b24631c3' into gingerbread-plus-aosp

* commit '12006013cc2cd0a076855ed068f5f782b24631c3':
  fixedfft: Only includes cpu-features.h when __arm__ is defined.