Merge changes from topic \'update_engine_deps\' into mnc-dr2-dev
am: b5368bf2b0

* commit 'b5368bf2b0ac58a071356b27d4c2acc26aded8d8':
  Sync libext2fs sources in Android.mk with Makefile.in
  libext2fs: Export the library include path.
  package version metadata for external/
  Wrap tune2fs.h to be C++ compatible.