Bug#292330: use UTF-8 by default

[Thorsten Glaser <tg@mirbsd.de>]

Roger Leigh dixit:

>> Does a C.UTF-8 exist? If yes, then this is a sound proposal,
>> I think.
>
>I believe that the "C" locale is supposed to be US_ASCII only.

That applies to “C” but not to a hypothetical “C.UTF-8” locale,
which would have to be set via setlocale(3) anyway, and differ
from “C” only in “LC_CTYPE” category.

//mirabile
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