Merge changes from topic \'update_engine_deps\' into mnc-dr2-dev am: b5368bf2b0
am: 9a4a69d59e

* commit '9a4a69d59eac52e710e7f8d01af9b1b64684c04e':
  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.