Make qtconcurrent map example compile on exotic compilers

Task-number: QTBUG-9015
Change-Id: I1019765312c8d55728023642601199506269be6d
Reviewed-by: Mitch Curtis <mitch.curtis@digia.com>

examples/qtconcurrent/map/main.cpp

@@ -64,7 +64,7 @@ int main(int argc, char *argv[])
 
     // Use QtConcurrentBlocking::mapped to apply the scale function to all the
     // images in the list.
-    QList<QImage> thumbnails = QtConcurrent::blockingMapped(images, scale);
+    QList<QImage> thumbnails = QtConcurrent::blockingMapped<QList<QImage> >(images, scale);
 
     return 0;
 }