Fixing typo in haversine formula.

radixmath/util.cc

@@ -109,7 +109,7 @@ Real haversine(Real lat1, Real lon1, Real lat2, Real lon2)
 
 Real greatCircleDistance(Real lat1, Real lon1, Real lat2, Real lon2, Real radius)
 {
-    return radius * haversine(lat1, lon2, lat2, lon2);
+    return radius * haversine(lat1, lon1, lat2, lon2);
 }
 
 } // namespace radix