patch 8.2.2233: cannot convert a byte index into a character index

Problem:    Cannot convert a byte index into a character index.
Solution:   Add charidx(). (Yegappan Lakshmanan, closes #7561)
diff --git a/src/version.c b/src/version.c
index 35f1def..71bc47d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2233,
+/**/
     2232,
 /**/
     2231,