remove drop libpax option (for issue #921)

include/senddata.h

@@ -17,6 +17,5 @@ void flushQueues(void);
 bool allQueuesEmtpy(void);
 void setSendIRQ(TimerHandle_t xTimer);
 void setSendIRQ(void);
-void initSendDataTimer(uint8_t sendcycle);
 
 #endif // _SENDDATA_H_