patch 7.4.1620

Problem:    Emoji characters are not considered as a kind of word character.
Solution:   Give emoji characters a word class number. (Yasuhiro Matsumoto)

src/version.c

@@ -748,6 +748,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1620,
 /**/
     1619,
 /**/