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diff --git a/src/3rdparty/assimp/code/qnan.h b/src/3rdparty/assimp/code/qnan.h
deleted file mode 100644
index fcff16b74..000000000
--- a/src/3rdparty/assimp/code/qnan.h
+++ /dev/null
@@ -1,156 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2017, assimp team
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-
-/**  @file  qnan.h
- *   @brief Some utilities for our dealings with qnans.
- *
- *   @note Some loaders use qnans to mark invalid values tempoarily, also
- *     Assimp explicitly enforces undefined normals to be set to qnan.
- *     qnan utilities are available in standard libraries (C99 for example)
- *     but last time I checked compiler coverage was so bad that I decided
- *     to reinvent the wheel.
- */
-
-#ifndef AI_QNAN_H_INCLUDED
-#define AI_QNAN_H_INCLUDED
-
-#include <assimp/defs.h>
-#include <limits>
-#include <stdint.h>
-
-// ---------------------------------------------------------------------------
-/** Data structure to represent the bit pattern of a 32 Bit
- *         IEEE 754 floating-point number. */
-union _IEEESingle
-{
-    float Float;
-    struct
-    {
-        uint32_t Frac : 23;
-        uint32_t Exp  : 8;
-        uint32_t Sign : 1;
-    } IEEE;
-};
-
-// ---------------------------------------------------------------------------
-/** Data structure to represent the bit pattern of a 64 Bit
- *         IEEE 754 floating-point number. */
-union _IEEEDouble
-{
-    double Double;
-    struct
-    {
-        uint64_t Frac : 52;
-        uint64_t Exp  : 11;
-        uint64_t Sign : 1;
-    } IEEE;
-};
-
-// ---------------------------------------------------------------------------
-/** Check whether a given float is qNaN.
- *  @param in Input value */
-AI_FORCE_INLINE bool is_qnan(float in)
-{
-    // the straightforward solution does not work:
-    //   return (in != in);
-    // compiler generates code like this
-    //   load <in> to <register-with-different-width>
-    //   compare <register-with-different-width> against <in>
-
-    // FIXME: Use <float> stuff instead? I think fpclassify needs C99
-    return (reinterpret_cast<_IEEESingle*>(&in)->IEEE.Exp == (1u << 8)-1 &&
-        reinterpret_cast<_IEEESingle*>(&in)->IEEE.Frac);
-}
-
-// ---------------------------------------------------------------------------
-/** Check whether a given double is qNaN.
- *  @param in Input value */
-AI_FORCE_INLINE bool is_qnan(double in)
-{
-    // the straightforward solution does not work:
-    //   return (in != in);
-    // compiler generates code like this
-    //   load <in> to <register-with-different-width>
-    //   compare <register-with-different-width> against <in>
-
-    // FIXME: Use <float> stuff instead? I think fpclassify needs C99
-    return (reinterpret_cast<_IEEEDouble*>(&in)->IEEE.Exp == (1u << 11)-1 &&
-        reinterpret_cast<_IEEEDouble*>(&in)->IEEE.Frac);
-}
-
-// ---------------------------------------------------------------------------
-/** @brief check whether a float is either NaN or (+/-) INF.
- *
- *  Denorms return false, they're treated like normal values.
- *  @param in Input value */
-AI_FORCE_INLINE bool is_special_float(float in)
-{
-    return (reinterpret_cast<_IEEESingle*>(&in)->IEEE.Exp == (1u << 8)-1);
-}
-
-// ---------------------------------------------------------------------------
-/** @brief check whether a double is either NaN or (+/-) INF.
- *
- *  Denorms return false, they're treated like normal values.
- *  @param in Input value */
-AI_FORCE_INLINE bool is_special_float(double in)
-{
-    return (reinterpret_cast<_IEEEDouble*>(&in)->IEEE.Exp == (1u << 11)-1);
-}
-
-// ---------------------------------------------------------------------------
-/** Check whether a float is NOT qNaN.
- *  @param in Input value */
-template<class TReal>
-AI_FORCE_INLINE bool is_not_qnan(TReal in)
-{
-    return !is_qnan(in);
-}
-
-// ---------------------------------------------------------------------------
-/** @brief Get a fresh qnan.  */
-AI_FORCE_INLINE ai_real get_qnan()
-{
-    return std::numeric_limits<ai_real>::quiet_NaN();
-}
-
-#endif // !! AI_QNAN_H_INCLUDED