patch 8.1.1178: when mouse click tests fails value of 'ttytype' is unknown

Problem:    When mouse click tests fails value of 'ttytype' is unknown.
Solution:   Add a message to the assert.
diff --git a/src/version.c b/src/version.c
index 939f378..585f2fd 100644
--- a/src/version.c
+++ b/src/version.c
@@ -772,6 +772,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1178,
+/**/
     1177,
 /**/
     1176,