bug#65325: "make check" hangs on Cygwin

[Eli Zaretskii]

> From: Bruno Haible <bruno@clisp.org>
> Date: Wed, 16 Aug 2023 00:08:08 +0200
> 
> Building Emacs (git sources from today) on Cygwin 2.9.0/x86_64:
> 1. I configured in a subdirectory (VPATH build) with options
>      --disable-silent-rules --without-all --without-x
> 2. "make" succeeds.
> 3. "make check" leads to a process that is stuck, does not continue
>    for several hours. It does not eat much CPU time, but nevertheless,
>    something is blocked. Log file 'make-check.log' is attached.

Thanks.  Alas, the maintainer of Cygwin Emacs (CC'ed) has been silent
for quite some time, so I'm not sure when and how this could be
addressed.