title: Using NDK library which is in /system/lib in Android application
body: <p>I want to use a NDK .so library which I placed in /system/lib on my Android 4.3 Riotboard.
  How to do this?
  Normally the library is compiled together with the application and is on the application folder,
  but I need to access the Linux file system, so this isn't enough.</p>
  
  <p>How to use such a library in my app?</p>