Stop exporting NDK prebuilt modules to Make

Make isn't going to use any of these anytime soon. So hide them from
make for now, and be sure to save the AndroidMk shared library
dependencies before we convert them to NDK dependencies.

And $(ACP) is no longer used by $(copy-file-to-target)

Change-Id: I8f8f7d0177d31ba4206c0bc1f2ff952dce53b6b4