qwt: fix project's URL

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/qwt/Config.in

@@ -5,7 +5,7 @@ config BR2_PACKAGE_QWT
 	  Qwt is a graphics extension to the Qt GUI application
 	  framework. It provides a 2D plotting widget and more.
 
-	  http://http://sourceforge.net/projects/qwt
+	  http://qwt.sourceforge.net/
 
 if BR2_PACKAGE_QWT