[PATCH 1/2] posix: User scratch_buffer on fnmatch

[Florian Weimer]

* Adhemerval Zanella via Libc-alpha:

> It removes the alloca usage on the string convertion to wide characters
> before calling the internal function.

We have a downstream-only patch to fall back the single byte handling in
case of multibyte decoding failure.  Basically it's a quick hack to fix
this bug:

  <https://sourceware.org/bugzilla/show_bug.cgi?id=14185>

Is this something we should upstream?  Or rework fnmatch so that * is
matched properly against arbitrary bytes?

Thanks,
Florian
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