ircd: Start a stdinc grammar header as a front to spirit.h.

include/ircd/grammar.h

@@ -0,0 +1,27 @@
+// Matrix Construct
+//
+// Copyright (C) Matrix Construct Developers, Authors & Contributors
+// Copyright (C) 2016-2019 Jason Volk <jason@zemos.net>
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice is present in all copies. The
+// full license for this software is available in the LICENSE file.
+
+#pragma once
+#define HAVE_IRCD_GRAMMAR_H
+
+namespace boost::spirit
+{
+	struct unused_type;
+}
+
+namespace boost::spirit::qi
+{
+	template<class it,
+	         class T1,
+	         class T2,
+	         class T3,
+	         class T4>
+	struct rule;
+}

include/ircd/ircd.h

@@ -36,6 +36,7 @@
 #include "stringops.h"
 #include "tokens.h"
 #include "iov.h"
+#include "grammar.h"
 #include "parse.h"
 #include "rfc1459.h"
 #include "json/json.h"