Avoid early expiration of timers on !RTOS

modules/libcom/src/timer/timer.cpp

@@ -65,7 +65,11 @@ void timer::start ( epicsTimerNotify & notify, const epicsTime & expire )
 void timer::privateStart ( epicsTimerNotify & notify, const epicsTime & expire )
 {
     this->pNotify = & notify;
-    this->exp = expire - ( this->queue.notify.quantum () / 2.0 );
+    this->exp = expire
+#ifdef TIMER_QUANTUM_BIAS
+            - ( this->queue.notify.quantum () / 2.0 )
+#endif
+            ;
 
     bool reschedualNeeded = false;
     if ( this->curState == stateActive ) {