patch 8.2.3351: Vim9: using a function by name may delete it

Problem:    Vim9: using a function by name may delete it. (Naohiro Ono)
Solution:   Increment the reference count when using a function by name.
            (closes #8760)

src/version.c

@@ -755,6 +755,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3351,
 /**/
     3350,
 /**/