devel: man-to-mdwn.pl: add GPLv3+ notice to manpages.mdwn

Make the generated head manual page (in the notmuchmail wiki)
display the licence information the whole notmuch software is licenced
under.

diff --git a/devel/man-to-mdwn.pl b/devel/man-to-mdwn.pl
index 5024569e5d846dee679f69583d493e1000d6d6ed..ea284d083146a889234e710b84d143898139bf53 100755 (executable)
--- a/devel/man-to-mdwn.pl
+++ b/devel/man-to-mdwn.pl
@@ -197,3 +197,9 @@ foreach (sort srt values %fhash)
     print "* $line";
     #warn $line;
 }
+print <<'EOF';
+
+The manual pages are licensed under
+[the GNU General Public License](http://www.gnu.org/licenses/gpl.txt),
+either version 3.0 or at your option any later version.
+EOF