am 7c55c3f5: Make sure to use the hand-tweaked-assembly version of the relevant mp3 code if building for ARM.

Merge commit '7c55c3f5f5997ca572d70ad513099a5af20a23c1' into eclair-mr2-plus-aosp

* commit '7c55c3f5f5997ca572d70ad513099a5af20a23c1':
  Make sure to use the hand-tweaked-assembly version of the relevant mp3 code if building for ARM.