Add path to native libraries inside apk

If an application has native code (and primary abi)
include path to corresponding folder inside apk-file
to ldLibraryPath when constructing PathClassLoader

Bug: 21647354
Bug: 21667767
Bug: 21726698
Bug: 8076853
Change-Id: Ib0a2f01ee69019d3206a00c542bd7d0f58d0c481