[musl] C23: other last minute changes

["Jₑₙₛ Gustedt" <jens.gustedt@inria.fr>]

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Hello,
there were other last minute (in the literal sense of the term)
changes to C23 that might impact musl. I updated the summary page at

        https://gustedt.gitlabpages.inria.fr/c23-library/

As far as I can see these are

   - `PRI` macros for narrow types now have to be exact, musl does not
     seem to conform to this new requirement

   - the `lc` specifier for `printf` does print NUL for a nul
     character, we already talked about this

For the first, a change is conforming to C17 so it can be done
immediately without problems. The second is in principle a normative
change in C and in POSIX, but it seems that all other POSIX
implementations already are doing this, so probably we should just
fall in line.

There are also

   - `mktime` and `timegm` are not supposed to change `tm_wday` if the
     conversion fails

   - `fputwc` now also sets the error indicator of the stream if an
     encoding error occurs. This was previously already required by
     POSIX.

I don't think that musl has problems here

Jₑₙₛ

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