patch 8.0.0489: clipboard and "* register is not tested

Problem:    Clipboard and "* register is not tested.
Solution:   Add a test for Mac and X11. (Kazunobu Kuriyama)
diff --git a/src/Makefile b/src/Makefile
index 315548b..551bb6f 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -2185,6 +2185,7 @@
 	test_pyx2 \
 	test_pyx3 \
 	test_quickfix \
+	test_quotestar \
 	test_recover \
 	test_regexp_latin \
 	test_regexp_utf8 \