message: [android demo] Complete path to nsync library destination
  ......
  CMake Error at CMakeLists.txt:30 (set_target_properties):
  set_target_properties called with incorrect number of arguments.
  .....
diff: @@ -28,7 +28,7 @@ set_target_properties(lib_proto PROPERTIES IMPORTED_LOCATION
  add_library(lib_nsync STATIC IMPORTED )
  set_target_properties(lib_nsync PROPERTIES IMPORTED_LOCATION
  - ${TARGET_NSYNC_LIB})
  + ${TARGET_NSYNC_LIB}/lib/libnsync.a)
  add_library(lib_tf STATIC IMPORTED )
  set_target_properties(lib_tf PROPERTIES IMPORTED_LOCATION
  