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

[Eli Zaretskii]

> From: Glenn Morris <rgm@gnu.org>
> Cc: Eli Zaretskii <eliz@gnu.org>,  38632@debbugs.gnu.org,  rpluim@gmail.com
> Date: Wed, 08 Jan 2020 13:26:16 -0500
> 
> 
> 73fd8a4 fails to build on some GNU/Linux hosts, ref eg
> 
> https://hydra.nixos.org/build/109904668
>   
>   systhread.c:86:1: error: conflicting types for 'sys_thread_create'
>    sys_thread_create (sys_thread_t *t, const char *name,
>    ^~~~~~~~~~~~~~~~~
>   In file included from thread.h:33:0,
>                    from lisp.h:2163,
>                    from systhread.c:23:
>   systhread.h:115:13: note: previous declaration of 'sys_thread_create' was 
> here
>    extern bool sys_thread_create (sys_thread_t *, thread_creation_function *,
>                ^~~~~~~~~~~~~~~~~
>   make[1]: *** [Makefile:402: systhread.o] Error 1

Thanks, should be fixed now.