fix terrains.json, reduce config.h use

conf/e3/terrains.json

@@ -222,6 +222,6 @@
                     "div": "100"
                 }
             }
-        },
+        }
     }
 }

src/races/dragons.c

@@ -13,7 +13,6 @@
  */
 
 #include <platform.h>
-#include <kernel/config.h>
 
 /* kernel includes */
 #include <kernel/race.h>

src/races/illusion.c

@@ -11,7 +11,6 @@
  */
 
 #include <platform.h>
-#include <kernel/config.h>
 
 /* kernel includes */
 #include <kernel/race.h>

src/races/races.c

@@ -9,7 +9,6 @@
  */
 
 #include <platform.h>
-#include <kernel/config.h>
 #include "races.h"
 
 #include <kernel/building.h>

src/races/races.h

@@ -14,6 +14,7 @@
 #ifdef __cplusplus
 extern "C" {
 #endif
+    struct unit;
 
     void register_races(void);
     void make_undead_unit(struct unit *);

src/races/zombies.c

@@ -13,9 +13,9 @@
  */
 
 #include <platform.h>
-#include <kernel/config.h>
 
 /* kernel includes */
+#include <kernel/config.h>
 #include <kernel/race.h>
 #include <kernel/order.h>
 #include <kernel/unit.h>