Simply RFDEBUG define.
dout 1.3.0:
* Code rewrite
* dout support more complex parameter and debug level redefine
* Move RFDebugLevel to RFRuntime
* Remove DOUT_LOG_ENABLE, DAUTORELEASEPOOL_START, DOUT_START, DOUT_END
Fix warning: comparing floating point with == or != is unsafe [-Wfloat-equal]