patch 8.0.0289: no test for "ga" and :ascii

Problem:    No test for "ga" and :ascii.
Solution:   Add a test. (Dominique Pelle, closes #1429)
diff --git a/src/Makefile b/src/Makefile
index 922a09b..65c7881 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -2127,8 +2127,9 @@
 	test_fnameescape \
 	test_fnamemodify \
 	test_fold \
-	test_glob2regpat \
+	test_ga \
 	test_gf \
+	test_glob2regpat \
 	test_gn \
 	test_goto \
 	test_gui \