Introduce an compatibility layer which is empty for now.

Signed-off-by: Maximilian Wilhelm <max@sdn.clinic>

libifupdown/compat.c

@@ -0,0 +1,27 @@
+/*
+ * libifupdown/compat.c
+ * Purpose: compatiblity glue to other implementations
+ *
+ * Copyright (c) 2020 Maximilian Wilhelm <max@sdn.clinic>
+ *
+ * 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 appear in all copies.
+ *
+ * This software is provided 'as is' and without any warranty, express or
+ * implied.  In no event shall the authors be liable for any damages arising
+ * from the use of this software.
+ */
+
+#include <stdbool.h>
+#include "libifupdown/dict.h"
+
+extern bool
+lif_compat_apply(struct lif_dict *collection)
+{
+	(void) collection;
+
+	/* Mangle interfaces according to some config options here */
+
+	return true;
+}