[automerger skipped] Make libbnnmlowp buildable for native_bridge am: 4cc9a2fd0a am: b872981a5b -s ours

am skip reason: Change-Id I49fb7d0553555f13dea6c9e5fc733b97228ff1c3 with SHA-1 4cc9a2fd0a is in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/gemmlowp/+/12128242

Change-Id: I53a2e7a31c30ca155e627f80ac0fd668b436cc96