feat(physics): wire physx sdk into build

engine/third_party/physx/source/gpusolver/include/PxgSolverFlags.h

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+// Redistribution and use 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
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+//    documentation and/or other materials provided with the distribution.
+//  * Neither the name of NVIDIA CORPORATION nor the names of its
+//    contributors may be used to endorse or promote products derived
+//    from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''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,
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+// 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.
+//
+// Copyright (c) 2008-2025 NVIDIA Corporation. All rights reserved.
+// Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
+// Copyright (c) 2001-2004 NovodeX AG. All rights reserved.  
+
+#ifndef PXG_SOLVER_FLAGS_H
+#define PXG_SOLVER_FLAGS_H
+
+namespace physx
+{
+struct PxgSolverContactFlags
+{
+	enum Enum
+	{
+		eHAS_FORCE_THRESHOLDS = 1 << 0,
+
+		// This flag...
+		// - disables correlation of contact patches with friction patches from the previous frame
+		// - enables target velocities being read from the friction anchor contact points
+		//
+		// Two scenarios will raise this flag:
+		// - strong/sticky friction is disabled
+		// - contact modification sets a target velocity on contact points
+		ePER_POINT_FRICTION = 1 << 1,
+
+		eDISABLE_FRICTION = 1 << 2,
+		eCOMPLIANT_ACCELERATION_SPRING = 1 << 3,
+
+		eLAST
+	};
+};
+PX_COMPILE_TIME_ASSERT(PxgSolverContactFlags::eLAST <= ((1 << 7) + 1)); // we store these Flags as PxU8
+
+} // namespace physx
+
+#endif