Use -march=armv7-a on Android/ARM
Use -march=armv7-a on Android/ARM

The Android NDK compilers do not default to an ARMv7-A target,
but NaCl requires one.

BUG= https://code.google.com/p/nativeclient/issues/detail?id=3032
TEST= none
R=bradnelson@google.com

Review URL: https://codereview.chromium.org/15059012

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@11316 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client