Bug#434978: lintian: please add warning if emacs21 is preferred to emacs22

Package: lintian
Version: 1.23.32
Severity: wishlist

There is now emacs22 in lenny/sid (though emacs21 still
exists).
If a package prefer emacs21 (such as `emacs21 | emacsen'),
please
display a warning message to prefer emacs22.

Thanks,
--
Tatsuya Kinoshita