patch 7.4.851

Problem:    Saving and restoring the console buffer does not work properly.
Solution:   Instead of ReadConsoleOutputA/WriteConsoleOutputA use
            CreateConsoleScreenBuffer and SetConsoleActiveScreenBuffer.
            (Ken Takata)

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    851,
 /**/
     850,
 /**/