t7407: fix line endings for mingw build

Signed-off-by: Pat Thoyts <patthoyts@users.sourceforge.net>

t/t7407-submodule-foreach.sh

@@ -254,6 +254,10 @@ test_expect_success 'ensure "status --cached --recursive" preserves the --cached
 		) &&
 		git submodule status --cached --recursive -- nested1 > ../actual
 	) &&
+	if test_have_prereq MINGW
+	then
+		dos2unix actual
+	fi &&
 	test_cmp expect actual
 '