Add vbox 5.1 driver file

Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

src/vbox/vbox_V5_1.c

+/** @file vbox_V5_1.c
+ * C file to include support for multiple versions of VirtualBox
+ * at runtime.
+ */
+
+#include <config.h>
+
+/** The API Version */
+#define VBOX_API_VERSION 5001000
+/** Version specific prefix. */
+#define NAME(name) vbox51##name
+
+#include "vbox_tmpl.c"