licenses: Add QWT 1.0 license.

* guix/licenses.scm (qwt1.0): New variable.

Signed-off-by: Guillaume Le Vaillant <glv@posteo.net>

guix/licenses.scm

@@ -80,6 +80,7 @@
             perl-license
             psfl public-domain
             qpl
+            qwt1.0
             repoze
             ruby
             sgifreeb2.0
@@ -555,6 +556,11 @@ at URI, which may be a file:// URI pointing the package's tree."
            "http://directory.fsf.org/wiki/License:QPLv1.0"
            "http://www.gnu.org/licenses/license-list.html#QPL"))
 
+(define qwt1.0
+  (license "QWT 1.0"
+           "http://qwt.sourceforge.net/qwtlicense.html"
+           "GNU Lesser General Public License with exceptions"))
+
 (define repoze
   (license "Repoze"
            "http://repoze.org/LICENSE.txt"