[glibc] rt: Fix tst-aio{9,10}.c on clang-23

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=7d9be3fa30e6caee30270b12327c305870233e7b

commit 7d9be3fa30e6caee30270b12327c305870233e7b
Author: Adhemerval Zanella <[email protected]>
Date:   Tue Aug 11 14:18:25 2026 -0300

    rt: Fix tst-aio{9,10}.c on clang-23
    
    clang-23 enables -Wunused-but-set-global by default, which flags
    variables that are set but never read.

Diff:
---
 rt/tst-aio10.c | 2 --
 rt/tst-aio9.c  | 2 --
 2 files changed, 4 deletions(-)

diff --git a/rt/tst-aio10.c b/rt/tst-aio10.c
index ebd0193b3c..fbf5c6b7bf 100644
--- a/rt/tst-aio10.c
+++ b/rt/tst-aio10.c
@@ -8,7 +8,6 @@
 
 static pthread_barrier_t b;
 static pthread_t main_thread;
-static int flag;
 
 
 static void *
@@ -38,7 +37,6 @@ tf (void *arg)
 static void
 sh (int sig)
 {
-  flag = 1;
 }
 
 
diff --git a/rt/tst-aio9.c b/rt/tst-aio9.c
index c13d9f7e72..d85a248e7d 100644
--- a/rt/tst-aio9.c
+++ b/rt/tst-aio9.c
@@ -8,7 +8,6 @@
 
 static pthread_barrier_t b;
 static pthread_t main_thread;
-static int flag;
 
 
 static void *
@@ -38,7 +37,6 @@ tf (void *arg)
 static void
 sh (int sig)
 {
-  flag = 1;
 }