vdso: Diet include/vdso.h

In commit 2f5df09d
we included asm/type.h for bool definition. This
is fine in terms of CRIU but makes cpt2 converter
to carry the whole asm/type.h, sometimes causing
error due to confilicting definitions.

So lets be simplier and include <stdbool.h> instead.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

include/vdso.h

@@ -2,10 +2,10 @@
 #define __CR_VDSO_H__
 
 #include <sys/mman.h>
+#include <stdbool.h>
 
 #include "asm/vdso.h"
 #include "asm/int.h"
-#include "asm/types.h"
 
 #define VDSO_PROT		(PROT_READ | PROT_EXEC)