patch 8.2.0810: error when appending "tagfile" to 'wildoptions'

Problem:    Error when appending "tagfile" to 'wildoptions'.
Solution:   use flags P_ONECOMMA and P_NODUP. (Dmitri Vereshchagin,
            closes #6105)
diff --git a/src/version.c b/src/version.c
index 1ca9dee..9e8ba92 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    810,
+/**/
     809,
 /**/
     808,