patch 8.2.2718: Vim9: no explicit test for using a global function without g:

Problem:    Vim9: no explicit test for using a global function without the g:
            prefix.
Solution:   Add a test case.

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2718,
 /**/
     2717,
 /**/