BaseTools: remove WinNtInclude.h

Appears to be a relic for ancient windows / compiler versions,
windows builds in CI work just fine without it.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>
Reviewed-by: Rebecca Cran <rebecca@bsdio.com>

BaseTools/Source/C/GenFw/Elf64Convert.c

@@ -10,8 +10,6 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
 
 **/
 
-#include "WinNtInclude.h"
-
 #ifndef __GNUC__
 #include <windows.h>
 #include <io.h>