Allow to specify the output Android.mk file path.

- Allow to specify the output Android.mk file path.
  We need this to generate Android.mk into the out diretory.
- Makefile strings don't need quotes.
- Return non-zero exit code if it fails.
- Other trivial format changes.

Change-Id: I460083f6e0a2707cd4a6fe0bef3f8ae7562e9edb
2 files changed