Delete totally bogus code specifically targetted at mandoc

which tried to figure out whether mandoc supported UTF-8 output
(which it has been doing since 2011) and which passed the -T locale
option (which has been the default since 2014 and always will)
but which required the -V option to work (which was deleted half
a decade ago and will not come back).
Nowadays, it is safe to assume that mandoc just works with UTF-8
on both the input and output sides - in literally each and every
operating system providing a mandoc port or package, even those
that are seriously lagging behind.
This patch will also be pushed upstream.
OK tb@

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