patch 8.2.4439: accepting "iso8859" 'encoding' as "iso-8859-"

Problem:    Accepting "iso8859" 'encoding' as "iso-8859-".
Solution:   use "iso8859" as "iso-8859-1".
diff --git a/src/version.c b/src/version.c
index 399aef9..23f45b5 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4439,
+/**/
     4438,
 /**/
     4437,