Warning fix.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@40820 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/utils.cpp

@@ -1266,6 +1266,9 @@ wxWinVersion wxGetWinVersion()
             }
             break;
 
+        default:
+            // Do nothing just to silence GCC warning
+            break;
     }
 
     return wxWinVersion_Unknown;