bug#38632: 27.0.50; Emacs process name is changed permanently upon creating a named thread

[Eli Zaretskii]

> From: Robert Pluim <rpluim@gmail.com>
> Cc: 38632@debbugs.gnu.org,  yantar92@gmail.com
> Date: Thu, 19 Dec 2019 17:42:41 +0100
> 
> Hereʼs what it looks like.

Thanks, but I think we need to change thread.c to use ENCODE_SYSTEM
instead of ENCODE_UTF_8, since the name should be passed encoded in
the locale's codeset.