patch 8.0.0385: no tests for arabic

Problem:    No tests for arabic.
Solution:   Add a first test for arabic. (Dominique Pelle, closes #1518)
diff --git a/src/Makefile b/src/Makefile
index 09adb9a..0bdd1d4 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -2092,6 +2092,7 @@
 
 # Run individual NEW style test, assuming that Vim was already compiled.
 test_arglist \
+	test_arabic \
 	test_assert \
 	test_assign \
 	test_autochdir \