[glibc] hurd: Declare _hurd_intr_rpc_msg* with protected visibility

[Samuel Thibault <sthibaul@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=b6931d6d14c71fd229cc2ff94c810bd3390687db

commit b6931d6d14c71fd229cc2ff94c810bd3390687db
Author: Sergey Bugaev <bugaevc@gmail.com>
Date:   Wed Jan 3 20:14:35 2024 +0300

    hurd: Declare _hurd_intr_rpc_msg* with protected visibility
    
    These symbols are internal and never exported; make sure the compiler
    realizes that when compiling hurdsig.c and does not try to emit GOT
    reads.
    
    Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>

Diff:
---
 hurd/hurdsig.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/hurd/hurdsig.c b/hurd/hurdsig.c
index fe78819302..882a03471d 100644
--- a/hurd/hurdsig.c
+++ b/hurd/hurdsig.c
@@ -416,9 +416,9 @@ _hurdsig_abort_rpcs (struct hurd_sigstate *ss, int signo, int sigthread,
 		     struct machine_thread_all_state *state, int *state_change,
 		     void (*reply) (void))
 {
-  extern const void _hurd_intr_rpc_msg_about_to;
-  extern const void _hurd_intr_rpc_msg_setup_done;
-  extern const void _hurd_intr_rpc_msg_in_trap;
+  extern const void _hurd_intr_rpc_msg_about_to attribute_hidden;
+  extern const void _hurd_intr_rpc_msg_setup_done attribute_hidden;
+  extern const void _hurd_intr_rpc_msg_in_trap attribute_hidden;
   mach_port_t rcv_port = MACH_PORT_NULL;
   mach_port_t intr_port;