disable bson dependency, nobody is using that code

src/CMakeLists.txt

@@ -80,7 +80,7 @@ set (LIB_SRC
   attributes/raceprefix.c
   attributes/reduceproduction.c
   attributes/targetregion.c
-  bindings/bind_attrib.c
+#  bindings/bind_attrib.c
   bindings/bind_building.c
   bindings/bind_faction.c
   bindings/bind_gmtool.c

src/bindings/bind_unit.c

@@ -13,7 +13,9 @@ without prior permission by the authors of Eressea.
 #include <platform.h>
 
 #include "bind_unit.h"
-#include "bind_attrib.h"
+#ifdef BSON_ATTRIB
+# include "bind_attrib.h"
+#endif
 #include "bindings.h"
 
 /*  attributes includes */
@@ -60,6 +62,7 @@ static int tolua_unit_get_objects(lua_State * L)
   return 1;
 }
 
+#ifdef BSON_ATTRIB
 static int tolua_unit_get_attribs(lua_State * L)
 {
   unit *self = (unit *) tolua_tousertype(L, 1, 0);
@@ -74,6 +77,7 @@ static int tolua_unit_get_attribs(lua_State * L)
   lua_pushcclosure(L, tolua_attriblist_next, 1);
   return 1;
 }
+#endif
 
 int tolua_unitlist_nextf(lua_State * L)
 {
@@ -979,7 +983,9 @@ void tolua_unit_open(lua_State * L)
       tolua_variable(L, TOLUA_CAST "hp_max", &tolua_unit_get_hpmax, 0);
 
       tolua_variable(L, TOLUA_CAST "objects", &tolua_unit_get_objects, 0);
+#ifdef BSON_ATTRIB
       tolua_variable(L, TOLUA_CAST "attribs", &tolua_unit_get_attribs, 0);
+#endif
     }
     tolua_endmodule(L);
   }

src/eressea.c

@@ -13,7 +13,9 @@
 #include <lauxlib.h>
 #include <bindings/bindings.h>
 #include <bindings/helpers.h>
-#include <bindings/bind_attrib.h>
+#ifdef BSON_ATTRIB
+# include <bindings/bind_attrib.h>
+#endif
 #include <bindings/bind_building.h>
 #include <bindings/bind_faction.h>
 #include <bindings/bind_gmtool.h>
@@ -99,7 +101,9 @@ static lua_State *lua_init(void)
   tolua_ship_open(L);
   tolua_region_open(L);
   tolua_faction_open(L);
+#ifdef BSON_ATTRIB
   tolua_attrib_open(L);
+#endif
   tolua_unit_open(L);
   tolua_message_open(L);
   tolua_hashtable_open(L);