[bug #51322] [Patch] Change '-' to "\(en" (en-dash) when it is a numeric range

[Dave]

Follow-up Comment #1, bug #51322 (project groff):

This patch affects only year ranges in copyright dates (in 59 .man files). 
However, commit f00378ad
<http://git.savannah.gnu.org/cgit/groff.git/commit/?id=f00378ad> later came
along and moved these copyright notices out of the text of those files and
into comments, mooting this patch.  If there are no objections, I'm going to
close this bug as Invalid.

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