More NDK generated libs support.

Any NDK shared libraries not in LOCAL_SYSTEM_SHARED_LIBRARIES weren't
being pulled from the generated libs before since we were only
filtering my_system_shared_libraries and even if we had filtered
my_shared_libraries they would have been rewritten to my_ldlibs.

* Filter my_shared_libraries for NDK generated libs as well.
* Stop rewriting NDK LOCAL_SHARED_LIBRARIES to my_ldlibs. Instead,
  rewrite in the opposite direction just like we do for the platform.
* Move shared libs/ldlibs rewriting to before we filter NDK
  libraries out of shared libs/system shared libs.

Test: make checkbuild
Bug: http://b/27533932
Change-Id: If1860d9638de77089a46884f406766edaf362216