Debugger: Fix compile with MSVC2010

Change-Id: Ic75a4d6d7fc5cfd27f2a42b59b83366bb1822a39
Reviewed-by: hjk <hjk@theqtcompany.com>

src/plugins/debugger/watchhandler.cpp

@@ -1802,7 +1802,7 @@ WatchModel *WatchItem::watchModel()
 void WatchItem::parseWatchData(const GdbMi &input)
 {
     auto itemHandler = [this](const WatchData &data) {
-        WatchData::operator=(data);
+        static_cast<WatchData *>(this)->operator=(data); // FIXME with 3.5
     };
 
     auto childHandler = [this](const WatchData &innerData, const GdbMi &innerInput) {