patch 9.0.2099: win32: terminal codes clear the terminal

Problem:  Terminal control codes¹ are sent even when silent
          mode is on, causing the terminal to clear up
Solution: Block any terminal codes when silent mode is on

¹https://learn.microsoft.com/en-us/windows/console/console-virtual-terminal-sequences

fixes: #12822
closes: #13521

Signed-off-by: Nir Lichtman <nir@lichtman.org>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/os_win32.c

@@ -8578,6 +8578,9 @@ vtp_printf(
     DWORD   result;
     int	    len;
 
+    if (silent_mode)
+	return 0;
+
     va_start(list, format);
     len = vim_vsnprintf((char *)buf, 100, (char *)format, list);
     va_end(list);

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2099,
 /**/
     2098,
 /**/