[pushed] gdb: Support printf 'z' size modifier

[Eli Zaretskii]

> Cc: noreply@gnutoolchain-gerrit.osci.io, simon.marchi@polymtl.ca,
>  tromey@sourceware.org, brobecker@adacore.com, kevinb@redhat.com,
>  gdb-patches@sourceware.org
> From: Pedro Alves <palves@redhat.com>
> Date: Thu, 14 Nov 2019 17:06:20 +0000
> 
> Isn't gnulib taking care of this, by either enforcing __USE_MINGW_ANSI_STDIO,
> or by replacing printf with it's own implementation?

Only if you import the printf module.  Which I'm not sure we want,
because it's a MinGW only issue, and MinGW already has a solution.