diff --git a/3rdparty/cpprestsdk/src/pplx/pplx.cpp b/3rdparty/cpprestsdk/src/pplx/pplx.cpp
deleted file mode 100644
index 67101b3716e1e2f83c430b4be27c80e4f8fd9045..0000000000000000000000000000000000000000
--- a/3rdparty/cpprestsdk/src/pplx/pplx.cpp
+++ /dev/null
@@ -1,158 +0,0 @@
-/***
-* ==++==
-*
-* Copyright (c) Microsoft Corporation. All rights reserved.
-* Licensed under the Apache License, Version 2.0 (the "License");
-* you may not use this file except in compliance with the License.
-* You may obtain a copy of the License at
-* http://www.apache.org/licenses/LICENSE-2.0
-*
-* Unless required by applicable law or agreed to in writing, software
-* distributed under the License is distributed on an "AS IS" BASIS,
-* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-* See the License for the specific language governing permissions and
-* limitations under the License.
-*
-* ==--==
-* =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
-*
-* Parallel Patterns Library implementation (common code across platforms)
-*
-* For the latest on this and related APIs, please see http://casablanca.codeplex.com.
-*
-* =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
-****/
-
-#include "stdafx.h"
-
-#if !defined(_WIN32) || _MSC_VER < 1800 || CPPREST_FORCE_PPLX
-
-#include "pplx/pplx.h"
-
-// Disable false alarm code analyze warning
-#if defined(_MSC_VER)
-#pragma warning (disable : 26165 26110)
-#endif
-
-namespace pplx
-{
-
-
-namespace details
-{
-    /// <summary>
-    /// Spin lock to allow for locks to be used in global scope
-    /// </summary>
-    class _Spin_lock
-    {
-    public:
-
-        _Spin_lock()
-            : _M_lock(0)
-        {
-        }
-
-        void lock()
-        {
-            if ( details::atomic_compare_exchange(_M_lock, 1l, 0l) != 0l )
-            {
-                do
-                {
-                    pplx::details::platform::YieldExecution();
-
-                } while ( details::atomic_compare_exchange(_M_lock, 1l, 0l) != 0l );
-            }
-        }
-
-        void unlock()
-        {
-            // fence for release semantics
-            details::atomic_exchange(_M_lock, 0l);
-        }
-
-    private:
-        atomic_long _M_lock;
-    };
-
-    typedef ::pplx::scoped_lock<_Spin_lock> _Scoped_spin_lock;
-} // namespace details
-
-static struct _pplx_g_sched_t
-{
-    typedef std::shared_ptr<pplx::scheduler_interface> sched_ptr;
-
-    _pplx_g_sched_t()
-    {
-        m_state = post_ctor;
-    }
-
-    ~_pplx_g_sched_t()
-    {
-        m_state = post_dtor;
-    }
-
-    sched_ptr get_scheduler()
-    {
-        switch (m_state)
-        {
-        case post_ctor:
-            // This is the 99.9% case.
-
-            if (!m_scheduler)
-            {
-                ::pplx::details::_Scoped_spin_lock lock(m_spinlock);
-                if (!m_scheduler)
-                {
-                    m_scheduler = std::make_shared< ::pplx::default_scheduler_t>();
-                }
-            }
-
-            return m_scheduler;
-        default:
-            // This case means the global m_scheduler is not available.
-            // We spin off an individual scheduler instead.
-            return std::make_shared< ::pplx::default_scheduler_t>();
-        }
-    }
-
-    void set_scheduler(sched_ptr scheduler)
-    {
-        if (m_state == pre_ctor || m_state == post_dtor) {
-            throw invalid_operation("Scheduler cannot be initialized now");
-        }
-
-        ::pplx::details::_Scoped_spin_lock lock(m_spinlock);
-
-        if (m_scheduler != nullptr)
-        {
-            throw invalid_operation("Scheduler is already initialized");
-        }
-
-        m_scheduler = std::move(scheduler);
-    }
-
-    enum
-    {
-        pre_ctor = 0,
-        post_ctor = 1,
-        post_dtor = 2
-    } m_state;
-
-private:
-    pplx::details::_Spin_lock m_spinlock;
-    sched_ptr m_scheduler;
-} _pplx_g_sched;
-
-_PPLXIMP std::shared_ptr<pplx::scheduler_interface> _pplx_cdecl get_ambient_scheduler()
-{
-    return _pplx_g_sched.get_scheduler();
-}
-
-_PPLXIMP void _pplx_cdecl set_ambient_scheduler(std::shared_ptr<pplx::scheduler_interface> _Scheduler)
-{
-    _pplx_g_sched.set_scheduler(std::move(_Scheduler));
-}
-
-} // namespace pplx
-
-#endif