tests: avoid spurious test failure in set-GID build dir

* tests/install/install-C-root: Skip this test if in set-gid directory.
Reported by Sven Joachim and C de-Avillez.

diff --git a/tests/install/install-C-root b/tests/install/install-C-root
index df2843d21a61c8adbd5210665b3d0690a2219ba3..234ebe790e14ff51887b1d363ad2432b21bbc300 100755 (executable)
--- a/tests/install/install-C-root
+++ b/tests/install/install-C-root
@@ -23,6 +23,7 @@ fi
 
 . $srcdir/test-lib.sh
 require_root_
+skip_if_setgid_
 
 u1=1
 u2=2