Host multilib build.

Bug: 13751317
Change-Id: I05ad98c1f3f55e3288fbcc169311a7685b872fd9
Fix MIPS build.

We really ought to remove libportable.

Bug: 14903517
Change-Id: Id96b24bfe329096adffd94d452f440295d8aa83a
Merge "Host multilib build."
Merge "Fix MIPS build."
auto-merger: merge in from aosp/master