patch 9.1.0855: setting 'cmdheight' may cause hit-enter-prompt

Problem:  setting 'cmdheight' may cause hit-enter-prompt and echo output
          to be missing
Solution: Before cleaning the cmdline, check the need_wait_return flag
          (nwounkn)

closes: #13432

Signed-off-by: nwounkn <nwounkn@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index 5337b1a..22473eb 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    855,
+/**/
     854,
 /**/
     853,