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diff --git a/thirdparty/bullet/src/BulletDynamics/Dynamics/btDiscreteDynamicsWorldMt.h b/thirdparty/bullet/src/BulletDynamics/Dynamics/btDiscreteDynamicsWorldMt.h
deleted file mode 100644
index 2f144cdda4..0000000000
--- a/thirdparty/bullet/src/BulletDynamics/Dynamics/btDiscreteDynamicsWorldMt.h
+++ /dev/null
@@ -1,134 +0,0 @@
-/*
-Bullet Continuous Collision Detection and Physics Library
-Copyright (c) 2003-2009 Erwin Coumans  http://bulletphysics.org
-
-This software is provided 'as-is', without any express or implied warranty.
-In no event will the authors be held liable for any damages arising from the use of this software.
-Permission is granted to anyone to use this software for any purpose, 
-including commercial applications, and to alter it and redistribute it freely, 
-subject to the following restrictions:
-
-1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
-2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
-3. This notice may not be removed or altered from any source distribution.
-*/
-
-
-#ifndef BT_DISCRETE_DYNAMICS_WORLD_MT_H
-#define BT_DISCRETE_DYNAMICS_WORLD_MT_H
-
-#include "btDiscreteDynamicsWorld.h"
-#include "btSimulationIslandManagerMt.h"
-#include "BulletDynamics/ConstraintSolver/btConstraintSolver.h"
-
-struct InplaceSolverIslandCallbackMt;
-
-///
-/// btConstraintSolverPoolMt - masquerades as a constraint solver, but really it is a threadsafe pool of them.
-///
-///  Each solver in the pool is protected by a mutex.  When solveGroup is called from a thread,
-///  the pool looks for a solver that isn't being used by another thread, locks it, and dispatches the
-///  call to the solver.
-///  So long as there are at least as many solvers as there are hardware threads, it should never need to
-///  spin wait.
-///
-class btConstraintSolverPoolMt : public btConstraintSolver
-{
-public:
-    // create the solvers for me
-    explicit btConstraintSolverPoolMt( int numSolvers );
-
-    // pass in fully constructed solvers (destructor will delete them)
-    btConstraintSolverPoolMt( btConstraintSolver** solvers, int numSolvers );
-
-    virtual ~btConstraintSolverPoolMt();
-
-    ///solve a group of constraints
-    virtual btScalar solveGroup( btCollisionObject** bodies,
-        int numBodies,
-        btPersistentManifold** manifolds,
-        int numManifolds,
-        btTypedConstraint** constraints,
-        int numConstraints,
-        const btContactSolverInfo& info,
-        btIDebugDraw* debugDrawer,
-        btDispatcher* dispatcher
-    ) BT_OVERRIDE;
-
-    virtual	void reset() BT_OVERRIDE;
-    virtual btConstraintSolverType getSolverType() const BT_OVERRIDE { return m_solverType; }
-
-private:
-    const static size_t kCacheLineSize = 128;
-    struct ThreadSolver
-    {
-        btConstraintSolver* solver;
-        btSpinMutex mutex;
-        char _cachelinePadding[ kCacheLineSize - sizeof( btSpinMutex ) - sizeof( void* ) ];  // keep mutexes from sharing a cache line
-    };
-    btAlignedObjectArray<ThreadSolver> m_solvers;
-    btConstraintSolverType m_solverType;
-
-    ThreadSolver* getAndLockThreadSolver();
-    void init( btConstraintSolver** solvers, int numSolvers );
-};
-
-
-
-///
-/// btDiscreteDynamicsWorldMt -- a version of DiscreteDynamicsWorld with some minor changes to support
-///                              solving simulation islands on multiple threads.
-///
-///  Should function exactly like btDiscreteDynamicsWorld.
-///  Also 3 methods that iterate over all of the rigidbodies can run in parallel:
-///     - predictUnconstraintMotion
-///     - integrateTransforms
-///     - createPredictiveContacts
-///
-ATTRIBUTE_ALIGNED16(class) btDiscreteDynamicsWorldMt : public btDiscreteDynamicsWorld
-{
-protected:
-    InplaceSolverIslandCallbackMt* m_solverIslandCallbackMt;
-
-    virtual void solveConstraints(btContactSolverInfo& solverInfo) BT_OVERRIDE;
-
-    virtual void predictUnconstraintMotion( btScalar timeStep ) BT_OVERRIDE;
-
-    struct UpdaterCreatePredictiveContacts : public btIParallelForBody
-    {
-        btScalar timeStep;
-        btRigidBody** rigidBodies;
-        btDiscreteDynamicsWorldMt* world;
-
-        void forLoop( int iBegin, int iEnd ) const BT_OVERRIDE
-        {
-            world->createPredictiveContactsInternal( &rigidBodies[ iBegin ], iEnd - iBegin, timeStep );
-        }
-    };
-    virtual void createPredictiveContacts( btScalar timeStep ) BT_OVERRIDE;
-
-    struct UpdaterIntegrateTransforms : public btIParallelForBody
-    {
-        btScalar timeStep;
-        btRigidBody** rigidBodies;
-        btDiscreteDynamicsWorldMt* world;
-
-        void forLoop( int iBegin, int iEnd ) const BT_OVERRIDE
-        {
-            world->integrateTransformsInternal( &rigidBodies[ iBegin ], iEnd - iBegin, timeStep );
-        }
-    };
-    virtual void integrateTransforms( btScalar timeStep ) BT_OVERRIDE;
-
-public:
-	BT_DECLARE_ALIGNED_ALLOCATOR();
-
-	btDiscreteDynamicsWorldMt(btDispatcher* dispatcher,
-        btBroadphaseInterface* pairCache,
-        btConstraintSolverPoolMt* constraintSolver,   // Note this should be a solver-pool for multi-threading
-        btCollisionConfiguration* collisionConfiguration
-    );
-	virtual ~btDiscreteDynamicsWorldMt();
-};
-
-#endif //BT_DISCRETE_DYNAMICS_WORLD_H