patch 8.2.1290: Vim9: cannot replace a global function

Problem:    Vim9: cannot replace a global function.
Solution:   Allow for "!" on a global function. (closes #6524)  Also fix that
            :delfunc on a :def function only made it empty.

src/version.c

@@ -754,6 +754,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1290,
 /**/
     1289,
 /**/