[glibc] Remove support setting custom demuxers during signal handling.

[Samuel Thibault <sthibaul@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=fa93858a88b109a19656931e68b48d06eedff5b5

commit fa93858a88b109a19656931e68b48d06eedff5b5
Author: Flavio Cruz <flaviocruz@gmail.com>
Date:   Mon Jan 30 01:52:53 2023 -0500

    Remove support setting custom demuxers during signal handling.
    
    We seem to call only into the exception and message server routines.
    Message-Id: <Y9dpRZs3QYk2oZm+@jupiter.tail36e24.ts.net>

Diff:
---
 hurd/msgportdemux.c | 17 -----------------
 1 file changed, 17 deletions(-)

diff --git a/hurd/msgportdemux.c b/hurd/msgportdemux.c
index 7587beda43..676e2e5008 100644
--- a/hurd/msgportdemux.c
+++ b/hurd/msgportdemux.c
@@ -20,18 +20,6 @@
 #include <hurd/signal.h>
 #include <stddef.h>
 
-struct demux
-  {
-    struct demux *next;
-    boolean_t (*demux) (mach_msg_header_t *inp,
-			mach_msg_header_t *outp);
-  };
-
-struct demux *_hurd_msgport_demuxers = NULL;
-
-extern boolean_t __msg_server (mach_msg_header_t *inp,
-			       mach_msg_header_t *outp);
-
 static boolean_t
 msgport_server (mach_msg_header_t *inp,
 		mach_msg_header_t *outp)
@@ -40,11 +28,6 @@ msgport_server (mach_msg_header_t *inp,
 				  mach_msg_header_t *outp);
   extern boolean_t _S_exc_server (mach_msg_header_t *inp,
 				  mach_msg_header_t *outp);
-  struct demux *d;
-
-  for (d = _hurd_msgport_demuxers; d != NULL; d = d->next)
-    if ((*d->demux) (inp, outp))
-      return 1;
 
   return (_S_exc_server (inp, outp)
 	  || _S_msg_server (inp, outp));