patch 8.1.0799: calling deleted function; test doesn't work on Mac

Problem:    Calling deleted function; test doesn't work on Mac.
Solution:   Wait for the function to be called before deleting it. Use a job
            to write to the pty, unless in the GUI. (Ozaki Kiichi,
            closes #3854)

src/version.c

@@ -791,6 +791,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    799,
 /**/
     798,
 /**/