Skip tests that require a filesystem that obeys POSIX permissions

Signed-off-by: Johannes Sixt <j6t@kdbg.org>
diff --git a/t/t1301-shared-repo.sh b/t/t1301-shared-repo.sh
index 653362b..dc44854 100755
--- a/t/t1301-shared-repo.sh
+++ b/t/t1301-shared-repo.sh
@@ -26,7 +26,7 @@
 
 for u in 002 022
 do
-	test_expect_success "shared=1 does not clear bits preset by umask $u" '
+	test_expect_success POSIXPERM "shared=1 does not clear bits preset by umask $u" '
 		mkdir sub && (
 			cd sub &&
 			umask $u &&
@@ -54,7 +54,7 @@
 	test 2 = $(git config core.sharedrepository)
 '
 
-test_expect_success 'update-server-info honors core.sharedRepository' '
+test_expect_success POSIXPERM 'update-server-info honors core.sharedRepository' '
 	: > a1 &&
 	git add a1 &&
 	test_tick &&
@@ -85,7 +85,7 @@
 	git config core.sharedrepository "$u" &&
 	umask 0277 &&
 
-	test_expect_success "shared = $u ($y) ro" '
+	test_expect_success POSIXPERM "shared = $u ($y) ro" '
 
 		rm -f .git/info/refs &&
 		git update-server-info &&
@@ -97,7 +97,7 @@
 	'
 
 	umask 077 &&
-	test_expect_success "shared = $u ($x) rw" '
+	test_expect_success POSIXPERM "shared = $u ($x) rw" '
 
 		rm -f .git/info/refs &&
 		git update-server-info &&
@@ -111,7 +111,7 @@
 
 done
 
-test_expect_success 'git reflog expire honors core.sharedRepository' '
+test_expect_success POSIXPERM 'git reflog expire honors core.sharedRepository' '
 	git config core.sharedRepository group &&
 	git reflog expire --all &&
 	actual="$(ls -l .git/logs/refs/heads/master)" &&