[PATCH] Update gnulib to current trunk

[Pedro Alves]

On 6/30/20 8:19 PM, Christian Biesinger via Gdb-patches wrote:
> It looks like the original message is in the moderation queue because
> it's a little too big, so re-sending this as a gzipped attachment.
> 
> This fixes two issues on Windows: Update.
> https://sourceware.org/pipermail/gdb-patches/2020-June/169978.html

This seems to be bringing in a good amount of churn.

I'm lazy, so I'll copy&paste my comments from:
 https://sourceware.org/legacy-ml/gdb-patches/2018-08/msg00768.html

"It is standard practice when updating gnulib to discuss the set of
modules that the exercise brings in due to module dependencies.
If we're now including some more modules, that may mean that
we could eliminate some older host compatibility code from gdb
in favor of gnulib's and list the module dependencies
explicitly in IMPORTED_GNULIB_MODULES in update-gnulib.h.

Conversely, there's a chance that we were depending on some
module that wasn't explicitly listed in IMPORTED_GNULIB_MODULES,
and an update could remove the module by mistake.

Another reason for that is that that are some modules that
are problematic for us (e.g., the one that pulls in Windows's
select replacement), so we need to look out for that, in case
it is pulled in by a dependency."