patch 8.2.0447: terminal scroll tests fails on some systems

Problem:    Terminal scroll tests fails on some systems.
Solution:   Remove the fixed 100msec wait for Win32.  Add a loop to wait until
            scrolling has finished. (James McCoy, closes #5842)

src/version.c

@@ -738,6 +738,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    447,
 /**/
     446,
 /**/