toolchain: replace ifc interface compiler with xpcg

xpcg is used to generate xpc interfaces

toolchain/xpcg/interface.h

@@ -0,0 +1,26 @@
+#ifndef XPCG_INTERFACE_H_
+#define XPCG_INTERFACE_H_
+
+#include <blue/core/queue.h>
+
+struct msg_definition;
+
+struct interface_definition {
+	char *if_name;
+	long long if_id;
+	b_queue if_msg;
+};
+
+extern struct interface_definition *interface_definition_create(
+	const char *name,
+	long long id);
+extern void interface_definition_destroy(struct interface_definition *iface);
+
+extern bool interface_definition_has_msg(
+	const struct interface_definition *iface,
+	const char *name);
+extern void interface_definition_add_msg(
+	struct interface_definition *iface,
+	struct msg_definition *msg);
+
+#endif