title: How to add prebuilt *.so library in android studio 2.2
body: <p>I tried to add library into project, but android studio ignore my lib. 
  My CmakeLists.txt
  <code>add_library( mylib SHARED IMPORTED )
   set_target_properties(ffmpeg PROPERTIES IMPORTED_LOCATION src/main /libs/${ANDROID_ABI}/libmylib.so )</code></p>
  
  <p>After building my apk not contain libmylib.so. How to add prebuilt library into project with cmake?</p>