overrided addSearchPath() by Runtime.cpp should support second argument as CCFileUtils.cpp does.
init arg1 as false for safety
Merge pull request #8976 from hongliang-goudou/runtime_addSearchPath_argc

overrided addSearchPath() by Runtime.cpp should support second argument
overrided addSearchPath() by Runtime.cpp should support second argument as CCFileUtils.cpp does.
init arg1 as false for safety
Merge commit '5ee8f0a134ad6ae9f8261bcd54e235f2e74d9fb4' into v3-dev

* commit '5ee8f0a134ad6ae9f8261bcd54e235f2e74d9fb4':
  init arg1 as false for safety
  overrided addSearchPath() by Runtime.cpp should support second argument as CCFileUtils.cpp does.