Core/Tools: Fix brutal linking in mmaps extractor.

* caused warnings with shared linking
* ref #15671

(cherry picked from commit 13654bac2c41b2971915e706b5304a3ce6089a47)

src/common/Collision/Maps/MapTree.cpp

@@ -474,4 +474,10 @@ namespace VMAP
         }
         iLoadedTiles.erase(tile);
     }
+
+    void StaticMapTree::getModelInstances(ModelInstance* &models, uint32 &count)
+    {
+        models = iTreeValues;
+        count = iNTreeValues;
+    }
 }