patch 8.1.1315: there is always a delay if a termrequest is never answered

Problem:    There is always a delay if a termrequest is never answered.
Solution:   When the response is not received within two seconds consider the
            request to have failed.
diff --git a/src/version.c b/src/version.c
index 50c8339..0e40f61 100644
--- a/src/version.c
+++ b/src/version.c
@@ -768,6 +768,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1315,
+/**/
     1314,
 /**/
     1313,