lte: Move UE_MEASUREMENT_REPORT_DELAY definition to .cc file

src/lte/model/lte-ue-rrc.cc

@@ -43,6 +43,7 @@
 
 namespace ns3
 {
+const Time UE_MEASUREMENT_REPORT_DELAY = MicroSeconds(1);
 
 NS_LOG_COMPONENT_DEFINE("LteUeRrc");
 

src/lte/model/lte-ue-rrc.h

@@ -60,7 +60,7 @@ namespace ns3
  *  - time-to-trigger check is always performed before the reporting, so there
  *    would still be chance for it to cancel the reporting if necessary.
  */
-static const Time UE_MEASUREMENT_REPORT_DELAY = MicroSeconds(1);
+extern const Time UE_MEASUREMENT_REPORT_DELAY;
 
 class LteRlc;
 class LteMacSapProvider;