Revert "Remove unnecessary -mfpu=neon flag."
Revert "Remove unnecessary -mfpu=neon flag."

This reverts commit c19aa19f04f257ba4780c9a05072d5a14c591eee.

Change-Id: I90b7cc6c6502db8f028ea0faee02cb256a289012

boulzordev/android_external_gemmlowp,boulzordev/android_external_gemmlowp