make header idempotent
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/* $NetBSD: blacklist.h,v 1.2 2015/01/22 05:35:55 christos Exp $ */
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/* $NetBSD: blacklist.h,v 1.3 2015/01/23 18:48:56 christos Exp $ */
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/*-
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* Copyright (c) 2014 The NetBSD Foundation, Inc.
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@ -31,6 +31,8 @@
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#ifndef _BLACKLIST_H
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#define _BLACKLIST_H
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#include <sys/socket.h>
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__BEGIN_DECLS
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struct blacklist *blacklist_open(void);
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void blacklist_close(struct blacklist *);
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