xen: Clean up includes

Clean up includes so that osdep.h is included first and headers
which it implies are not included manually.

This commit was created with scripts/clean-includes.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1453832250-766-14-git-send-email-peter.maydell@linaro.org
diff --git a/hw/net/xen_nic.c b/hw/net/xen_nic.c
index 3ffb07d..7281730 100644
--- a/hw/net/xen_nic.c
+++ b/hw/net/xen_nic.c
@@ -19,18 +19,9 @@
  *  GNU GPL, version 2 or (at your option) any later version.
  */
 
-#include <stdio.h>
-#include <stdlib.h>
-#include <stdarg.h>
-#include <string.h>
-#include <unistd.h>
-#include <inttypes.h>
-#include <fcntl.h>
-#include <errno.h>
+#include "qemu/osdep.h"
 #include <sys/socket.h>
 #include <sys/ioctl.h>
-#include <sys/types.h>
-#include <sys/stat.h>
 #include <sys/mman.h>
 #include <sys/wait.h>