Fixed an unused parameter error.

code/scorpia_cpp/egd/egd_impl/rheology/egd_MarkerRheology_rotDisc.cpp

@@ -147,6 +147,9 @@ using ::std::sqrt;
 	(void)tSol;
 	(void)nodeStress;
 	(void)nodeStrain;
+	(void)thisDt;
+	(void)tStepIdx;
+	(void)currTime;
 }; //End: modify the marker properties.