fix vs bool - int conversion warning

src/kernel/config.c

@@ -1057,7 +1057,7 @@ int rule_give(void)
     return config_get_int("rules.give.flags", GIVE_DEFAULT);
 }
 
-bool markets_module(void)
+int markets_module(void)
 {
     return config_get_int("modules.markets", 0);
 }

src/kernel/config.h

@@ -135,7 +135,7 @@ struct param;
 #define GUARD_ALL 0xFFFF
 
     int maxworkingpeasants(const struct region *r);
-    bool markets_module(void);
+    int markets_module(void);
     int wage(const struct region *r, const struct faction *f,
         const struct race *rc, int in_turn);