patch 8.1.1114: confusing overloaded operator "." for string concatenation

Problem:    Confusing overloaded operator "." for string concatenation.
Solution:   Add ".." for string concatenation.  Also "let a ..= b".
diff --git a/src/version.c b/src/version.c
index 3805950..0b86e19 100644
--- a/src/version.c
+++ b/src/version.c
@@ -772,6 +772,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1114,
+/**/
     1113,
 /**/
     1112,