Don't uncompress/page-align the jni libraries in apps_only build.

Don't uncompress/page-align the jni libraries in apps_only build,
because the apk may be run on older platforms that don't support loading
jni directly from apk.
When prebuilt apks are installed to platform build, the build system
will automatically uncompress/page-align the prebuit apks in M and
downstream, so no need to uncompress/page-align in the apps_only build
either.

Bug: 22491084
Change-Id: I67e977b2592800ae467450592069843b4e5fc466