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

[Tatsuya Kinoshita <tats@vega.ocn.ne.jp>]

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

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