[Client] Fix GCC build

Based on 71040659ac39dc1236af654b5c3177d015e749e5

apps/openmw/mwbase/world.hpp

@@ -323,7 +323,7 @@ namespace MWBase
 
                 Make it possible to set the physics framerate from elsewhere
             */
-            virtual void World::setPhysicsFramerate(float physFramerate) = 0;
+            virtual void setPhysicsFramerate(float physFramerate) = 0;
             /*
                 End of tes3mp addition
             */

apps/openmw/mwmp/LocalPlayer.cpp

@@ -1114,7 +1114,7 @@ void LocalPlayer::setEquipment()
             else
             {
                 // Don't try to equip an item that is already equipped
-                if (!ptrInventory.getSlot(slot).isEqual(it))
+                if (ptrInventory.getSlot(slot) != it)
                     ptrInventory.equip(slot, it, ptrPlayer);
             }
         }

apps/openmw/mwworld/worldimp.hpp

@@ -422,7 +422,7 @@ namespace MWWorld
 
                 Make it possible to set the physics framerate from elsewhere
             */
-            void World::setPhysicsFramerate(float physFramerate);
+            void setPhysicsFramerate(float physFramerate);
             /*
                 End of tes3mp addition
             */