vl: Don't include vde header

Nothing in vl.c uses anything from the vde package, do remove the
unnecessary include.

Signed-off-by: Fam Zheng <famz@redhat.com>
Message-Id: <20170907083552.17725-2-famz@redhat.com>
Reviewed-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Fam Zheng <famz@redhat.com>

vl.c

@@ -32,10 +32,6 @@
 #include "sys/prctl.h"
 #endif
 
-#if defined(CONFIG_VDE)
-#include <libvdeplug.h>
-#endif
-
 #ifdef CONFIG_SDL
 #if defined(__APPLE__) || defined(main)
 #include <SDL.h>