patch 8.2.4209: partial in 'opfunc' cannot use an imported function

Problem:    partial in 'opfunc' cannot use an imported function.
Solution:   Also expand the function name in a partial. (closes #9614)
diff --git a/src/version.c b/src/version.c
index 3b7cddd..4c263ae 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4209,
+/**/
     4208,
 /**/
     4207,