am fb234bbe: merge from open-source master

Merge commit 'fb234bbe5e7cbae42b4fc8f4ab353ba561599db2' into kraken

* commit 'fb234bbe5e7cbae42b4fc8f4ab353ba561599db2':
  Notify user regarding invalid number during MO call.
  Build software AGL library with correct get_tls() macro for ARMv7 based platforms
  Fix glReadPixels() to verify that both x and y are non-negative.