tests: skip new install-C test if working directory is set-gid

* tests/install/install-C: Use setgid-check.

diff --git a/tests/install/install-C b/tests/install/install-C
index 2cddaff..3bf0c7b 100755 (executable)
--- a/tests/install/install-C
+++ b/tests/install/install-C
@@ -22,6 +22,7 @@ if test "$VERBOSE" = yes; then
 fi
 
 . $srcdir/test-lib.sh
+. "$abs_srcdir/setgid-check"
 
 mode1=0644
 mode2=0755