am 02352378: Remove emulator-based dexpreopt logic from the build system.

Merge commit '0235237805991b48831dc8add072a50c478b2fcb' into gingerbread-plus-aosp

* commit '0235237805991b48831dc8add072a50c478b2fcb':
  Remove emulator-based dexpreopt logic from the build system.