am 50d7d7a0: Fix private vars for host-dex rules.

Merge commit '50d7d7a0a68378d1b02b5d2a2514592ba0d65f84' into gingerbread-plus-aosp

* commit '50d7d7a0a68378d1b02b5d2a2514592ba0d65f84':
  Fix private vars for host-dex rules.