qemu-img: Remove unneeded include files

There is no dependency on windows.h, and the standard include files are
already included by qemu-common.h.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

qemu-img.c

@@ -32,12 +32,6 @@
 #include "block/block_int.h"
 #include "block/qapi.h"
 #include <getopt.h>
-#include <stdio.h>
-#include <stdarg.h>
-
-#ifdef _WIN32
-#include <windows.h>
-#endif
 
 typedef struct img_cmd_t {
     const char *name;