Make libbnnmlowpV8 buildable for native_bridge am: ca41a583fa am: 9a1064499e am: 64224bd699 am: 3ae8449de3

Original change: https://android-review.googlesource.com/c/platform/external/gemmlowp/+/1354665

Change-Id: If8e47980c67acc7a665f22d94a800692212bac1d