Workaround for mingw.

modules/juce_gui_extra/native/juce_win32_WebBrowserComponent.cpp

@@ -151,7 +151,7 @@ private:
                                                                                                     : VARIANT_TRUE;
                 return S_OK;
             }
-            else if (dispIdMember == DISPID_NEWWINDOW3)
+            else if (dispIdMember == 273 /*DISPID_NEWWINDOW3*/)
             {
                 owner.newWindowAttemptingToLoad (pDispParams->rgvarg[0].bstrVal);
                 *pDispParams->rgvarg[3].pboolVal = VARIANT_TRUE;