Fix cyclic header dependency problem

src/actions.h

@@ -35,6 +35,7 @@ typedef action_result (*action_func)(struct server *srv, struct connection *con,
 
 #include "condition.h"
 #include "plugin.h"
+#include "options.h"
 
 struct action_list {
 	gint refcount;

src/options.h

@@ -16,7 +16,7 @@ typedef struct option option;
 struct option_set;
 typedef struct option_set option_set;
 
-#include "base.h"
+#include "settings.h"
 
 struct option {
 	option_type type;