[PATCH] configure.ac: Add mandoc as valid formatter

[Wolfgang Müller]

Hi,

On systems that have mandoc installed but are missing an nroff binary,
the configure script will fall back to pre-formatted manual pages
despite the fact that mandoc could be used.

The proposed patch adds mandoc as a valid formatter to configure.ac. As
mandoc supports the -mdoc flag, it can simply be added to the list of
nroff-like binaries.

Wolfgang
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