[automerger skipped] Make libbnnmlowp buildable for native_bridge am: 4cc9a2fd0a -s ours am: 9d3e620885 -s ours am: b2397ea19b -s ours

am skip reason: Change-Id I49fb7d0553555f13dea6c9e5fc733b97228ff1c3 with SHA-1 ebffc28dbb is in history

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

Change-Id: I125836b6bac9b7123ffb0559844a94f9bc6ec883