updated for version 7.3.406

Problem:    Multi-byte characters in b:browsefilter are not handled correctly.
Solution:   First use convert_filter() normally and then convert to wide
            characters. (Taro Muraoka)

src/version.c

@@ -714,6 +714,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    406,
 /**/
     405,
 /**/