fix for texinfo2man.c (redux)

Hi,

The indent(1) man page looks funny in a Unicode environment. It turns
out that's due to a bug in texinfo2man. It converts TeX quotes (` ')
to troff grave/acute accents (\` \') instead of troff quotes (\(oq
\(cq)). As a result, the manpage looks funny in terminals that use
Unicode characters.

It turns out this was reported nearly nine years ago:

https://lists.gnu.org/archive/html/bug-indent/2005-07/msg00000.html

Attached is the patch again, along with a minor change (replacing
malloc.h, which is not in POSIX, with stdlib.h).

Please commit. The diff is small. Thanks.

-- 
Anthony J. Bentley

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