Subzero requires full C++11 support, which isn't available on Android
versions prior to Marshmallow.

Change-Id: Icf09a51b525a1503f72441c969a9e364306096bd
Reviewed-on: https://swiftshader-review.googlesource.com/11488Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>