vl: Remove unneeded include file

This file does not depend on windows.h.

Cc: Anthony Liguori <aliguori@amazon.com>
Signed-off-by: NStefan Weil <sw@weilnetz.de>
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>
Reviewed-by: NAndreas Färber <afaerber@suse.de>
Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>

vl.c

@@ -38,10 +38,6 @@
 #include <libvdeplug.h>
 #endif
 
-#ifdef _WIN32
-#include <windows.h>
-#endif
-
 #ifdef CONFIG_SDL
 #if defined(__APPLE__) || defined(main)
 #include <SDL.h>