patch 8.2.4612: Vim9: cannot use a recursive call in a nested function

Problem:    Vim9: cannot use a recursive call in a nested function. (Sergey
            Vlasov)
Solution:   Define the funcref before compiling the function. (closes #9989)

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4612,
 /**/
     4611,
 /**/