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.
diff --git a/src/version.c b/src/version.c
index 64a6daa..af9caa4 100644
--- a/src/version.c
+++ b/src/version.c
@@ -778,6 +778,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1715,
+/**/
     1714,
 /**/
     1713,