Revert "Use aarch64-linux-android-4.9 for arm64 build (attempt #3)"

This reverts commit 084a7f83875d030c2e4819bed386c4a16168e731.

GCC 4.9 still has stability issues (b/14160872)

Change-Id: I4d40829dbbfac0e7b6cd7eaf9924744bc5714271
1 file changed