patch 8.1.0611: crash when using terminal with long composing characters

Problem:    Crash when using terminal with long composing characters.
Solution:   Make space for all characters. (Yasuhiro Matsumoto, closes #3619,
            closes #3703)
diff --git a/src/version.c b/src/version.c
index 3c194ae..99513d1 100644
--- a/src/version.c
+++ b/src/version.c
@@ -800,6 +800,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    611,
+/**/
     610,
 /**/
     609,