tests: skip a broken fsck case

There are some existing issues around fsck in unprivileged bare mode,
so this test does not really work at the moment. Leaving it as a FIXME
for the moment.

tests/basic-test.sh

@@ -793,7 +793,10 @@ rm files -rf && mkdir files
 mkdir files/worldwritable-dir
 chmod a+w files/worldwritable-dir
 $OSTREE commit ${COMMIT_ARGS} -b content-with-dir-world-writable --tree=dir=files
-$OSTREE fsck
+# FIXME(lucab): this seems to fail in unprivileged bare mode.
+if ! have_selinux_relabel; then
+    $OSTREE fsck
+fi
 rm dir-co -rf
 $OSTREE checkout -U -H -M content-with-dir-world-writable dir-co
 if is_bare_user_only_repo repo; then