Remove lingering system app native libs in /data

If a system app had a lingering native library in /data/data/<app>/lib,
it would prefer that over the one in /system/lib due to recent changed
in the Dalvik JNI class loading code.

To "fix" that we need to check if there are any native libraries in a
/data/data/<app>/lib directory for any non-updated system apps and
delete them during scanning.

Change-Id: If3a22e41a8531e9e5a44ba001dcea46253d47d45