patch 8.0.0771: cursor in terminal window not always updated in GUI

Problem:    Cursor in a terminal window not always updated in the GUI.
Solution:   Call gui_update_cursor(). (Yasuhiro Matsumoto, closes #1868)
diff --git a/src/version.c b/src/version.c
index 44e4404..10189f4 100644
--- a/src/version.c
+++ b/src/version.c
@@ -770,6 +770,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    771,
+/**/
     770,
 /**/
     769,