am e990e929: am 385cdb78: am 0dac6788: Merge "Revert "Revert "Turn on _FORTIFY_SOURCE=2 for the host."""

* commit 'e990e929a477298e8a496a2d59f9bcfad9ab628e':
  Revert "Revert "Turn on _FORTIFY_SOURCE=2 for the host.""