build: restore missing getGroundHeight arguments in GeneralsMD TerrainLogic

Author: bobtista

GeneralsMD/Code/GameEngine/Source/GameLogic/Map/TerrainLogic.cpp

@@ -2708,9 +2708,9 @@ void TerrainLogic::flattenTerrain(Object *obj)
 			Real avgHeight = totalHeight/numSamples;
 			Int rawDataHeight = REAL_TO_INT_FLOOR(0.5f + avgHeight/MAP_HEIGHT_SCALE);
 
-			// Compare to the height at the building's origin, because setRawMapHeight will only lower,
-			// not raise.  jba
-			Int centerHeight = REAL_TO_INT_FLOOR(getGroundHeight()/MAP_HEIGHT_SCALE);
+		// Compare to the height at the building's origin, because setRawMapHeight will only lower,
+		// not raise.  jba
+		Int centerHeight = REAL_TO_INT_FLOOR(getGroundHeight(pos->x, pos->y)/MAP_HEIGHT_SCALE);
 			if (rawDataHeight>centerHeight) rawDataHeight = centerHeight;
 
 			for (i=iMin.x; i<=iMax.x; i++) {