[glibc] elf: test: handle different rootsbindir in tst-ldconfig-cache

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=02ea17b5add83a205d8b204dce28f38fe0498ea3

commit 02ea17b5add83a205d8b204dce28f38fe0498ea3
Author: Xi Ruoyao <[email protected]>
Date:   Sun Jul 26 00:11:44 2026 +0800

    elf: test: handle different rootsbindir in tst-ldconfig-cache
    
    When compiling a glibc for a merged-/usr distro people may set
    rootsbindir=/usr/sbin.  But tst-ldconfig-cache has hard-coded
    /sbin/ldconfig path and so it fails with a different rootsbindir.
    
    Fix it by using support_install_rootsbindir like run_ldconfig in
    test-container.c.
    
    Signed-off-by: Xi Ruoyao <[email protected]>
    Reviewed-by: Florian Weimer <[email protected]>

Diff:
---
 elf/tst-ldconfig-cache.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/elf/tst-ldconfig-cache.c b/elf/tst-ldconfig-cache.c
index 9f71418b3a..f4820a1822 100644
--- a/elf/tst-ldconfig-cache.c
+++ b/elf/tst-ldconfig-cache.c
@@ -85,7 +85,10 @@ corrupt (void)
 static void
 ldconfig (void)
 {
-  xsystem ("/sbin/ldconfig -X");
+  char *cmd = xasprintf("%s/ldconfig -X", support_install_rootsbindir);
+  xsystem (cmd);
+
+  free(cmd);
 }
 
 /* Change ld.so.conf to refer to the new directory, and generate a new