patch 8.1.0834: GUI may wait too long before dealing with messages

Problem:    GUI may wait too long before dealing with messages.  Returning
            early may cause a mapping to time out.
Solution:   Use the waiting loop from Unix also for the GUI.
            (closes #3817, closes #3824)
diff --git a/src/version.c b/src/version.c
index 9572886..0a6dce2 100644
--- a/src/version.c
+++ b/src/version.c
@@ -784,6 +784,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    834,
+/**/
     833,
 /**/
     832,