patch 8.1.1715: emoji characters are seen as word characters for spelling

Problem:    Emoji characters are seen as word characters for spelling. (Gautam
            Iyer)
Solution:   Exclude class 3 from word characters.

src/spell.c

@@ -3077,7 +3077,7 @@ spell_mb_isword_class(int cl, win_T *wp)
     if (wp->w_s->b_cjk)
 	/* East Asian characters are not considered word characters. */
 	return cl == 2 || cl == 0x2800;
-    return cl >= 2 && cl != 0x2070 && cl != 0x2080;
+    return cl >= 2 && cl != 0x2070 && cl != 0x2080 && cl != 3;
 }
 
 /*

src/version.c

@@ -777,6 +777,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1715,
 /**/
     1714,
 /**/