lguest.h declares a struct timespec, make it include linux/time.h

Signed-off-by: Jes Sorensen <jes@sgi.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
diff --git a/include/linux/lguest.h b/include/linux/lguest.h
index ea335c8..9ddac2f 100644
--- a/include/linux/lguest.h
+++ b/include/linux/lguest.h
@@ -4,6 +4,7 @@
 #define _LINUX_LGUEST_H
 
 #ifndef __ASSEMBLY__
+#include <linux/time.h>
 #include <asm/irq.h>
 #include <asm/lguest_hcall.h>