linux-user: Fix compilation failure

Fix compilation failures for linux-user targets following recent
migration related commits bd2fa51fcd and 43487c67.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1372362818-4740-1-git-send-email-peter.maydell@linaro.org
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/include/migration/vmstate.h b/include/migration/vmstate.h
index ebc4d09..1c31b5d 100644
--- a/include/migration/vmstate.h
+++ b/include/migration/vmstate.h
@@ -26,7 +26,9 @@
 #ifndef QEMU_VMSTATE_H
 #define QEMU_VMSTATE_H 1
 
+#ifndef CONFIG_USER_ONLY
 #include <migration/qemu-file.h>
+#endif
 
 typedef void SaveStateHandler(QEMUFile *f, void *opaque);
 typedef int LoadStateHandler(QEMUFile *f, void *opaque, int version_id);