Support to build AAR for static Java libraries.

Set up rules to build $(built_aar), if a static Java library has Android
resources.
If you run "tapas my_lib && make dist", my_lib.aar will be built and put
in the DIST_DIR.

Bug: 18759503
Change-Id: I36b912eb7bbab241fe48319115ea320efe77c705
2 files changed