Fix compile on openSUSE Tumbleweed (gcc-14.2.1, glibc-2.40):
  - add missing sys/mount.h include

Fixes:

  pid_max.c: In function ‘pid_max_cb’:
  pid_max.c:42:15: error: implicit declaration of function ‘mount’ 
[-Wimplicit-function-declaration]
     42 |         ret = mount("", "/", NULL, MS_PRIVATE | MS_REC, 0);
        |               ^~~~~

Signed-off-by: Peter Seiderer <ps.rep...@gmx.net>
---
 tools/testing/selftests/pid_namespace/pid_max.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/testing/selftests/pid_namespace/pid_max.c 
b/tools/testing/selftests/pid_namespace/pid_max.c
index 51c414faabb0..96f274f0582b 100644
--- a/tools/testing/selftests/pid_namespace/pid_max.c
+++ b/tools/testing/selftests/pid_namespace/pid_max.c
@@ -10,6 +10,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <syscall.h>
+#include <sys/mount.h>
 #include <sys/wait.h>
 
 #include "../kselftest_harness.h"
-- 
2.47.1

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