Include audit.h so that the system call path protected by NFS_LEGACYRPC

can audit its arguments.

Submitted by:	Jaakko Heinonen <jh at saunalahti.fi>
MFC after:	1 week
X-MFC-note:	MFC with r188311

sys/nfsserver/nfs_syscalls.c

@@ -73,6 +73,8 @@ __FBSDID("$FreeBSD$");
 #include <nfsserver/nfsm_subs.h>
 #include <nfsserver/nfsrvcache.h>
 
+#include <security/audit/audit.h>
+
 #ifdef NFS_LEGACYRPC
 
 static MALLOC_DEFINE(M_NFSSVC, "nfss_srvsock", "Nfs server structure");