[patch] French hyphenation does not work

[Seb]

Hello,

Using groff 1.20.1, it seems that play with "-mfr" or try to load the hyphen.fr
file in a doc currently just draws groff to not make any hyphen at all.

Visibly, the problem comes from a trailing "\endinput" TeX command in hyphen.fr,
which prevents file from being loaded correctly.

This is really a little thing to fix, but I nevertheless join a patch. :)

Regards,
Seb

hyphen.fr.patch
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