Add support for building the NDK's native_app_glue.

Required for upcoming CTS tests that utilize the native_app_glue
framework to simplify native test apps.

In support of this feature:
https://code.google.com/p/android/issues/detail?id=63920

Change-Id: I3fe5dab26c147636538a4b519683493d8e78d26f
1 file changed