Add the GPU rigid body pipeline from https://github.com/erwincoumans/experiments as a Bullet 3.x preview for Bullet 2.80

Extras/RigidBodyGpuPipeline/dynamics/basic_demo/Stubs/AdlError.h

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+/*
+Copyright (c) 2012 Advanced Micro Devices, Inc.  
+
+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.
+*/
+//Originally written by Takahiro Harada
+
+
+#ifndef CL_ERROR_H
+#define CL_ERROR_H
+
+#ifdef DX11RENDER
+#include <windows.h>
+#endif
+
+#ifdef _DEBUG
+	#include <assert.h>
+	#define CLASSERT(x) if(!(x)){__debugbreak(); }
+	#define ADLASSERT(x) if(!(x)){__debugbreak(); }
+#else
+	#define CLASSERT(x) if(x){}
+	#define ADLASSERT(x) if(x){}
+
+#endif
+
+
+
+
+#ifdef _DEBUG
+	#define COMPILE_TIME_ASSERT(x) {int compileTimeAssertFailed[x]; compileTimeAssertFailed[0];}
+#else
+	#define COMPILE_TIME_ASSERT(x)
+#endif
+
+#ifdef _DEBUG
+	#include <stdarg.h>
+	#include <stdio.h>
+	__inline
+	void debugPrintf(const char *fmt, ...)
+	{
+		va_list arg;
+		va_start(arg, fmt);
+#ifdef DX11RENDER
+		char buf[256];
+		vsprintf_s( buf, 256, fmt, arg );
+#ifdef UNICODE
+		WCHAR wbuf[256];
+		int sizeWide = MultiByteToWideChar(0,0,buf,-1,wbuf,0);
+		MultiByteToWideChar(0,0,buf,-1,wbuf,sizeWide);
+
+//		swprintf_s( wbuf, 256, L"%s", buf );
+		OutputDebugString( wbuf );
+#else
+		OutputDebugString( buf );
+#endif
+#else
+		vprintf(fmt, arg);
+#endif
+		va_end(arg);
+	}
+#else
+	__inline
+	void debugPrintf(const char *fmt, ...)
+	{
+	}
+#endif
+
+
+#define WARN(msg) debugPrintf("WARNING: %s\n", msg);
+
+#endif
+