Fix: include NRIRayTracing.h in NRIWrapperVK.h - #260

NRIWrapperVK.h does not compile unless NRIRayTracing.h was included before it:

#include "NRI.h"
#include "Extensions/NRIWrapperVK.h"

Include/Extensions/NRIWrapperVK.h:110:9: error: unknown type name 'AccelerationStructureBits'; did you mean 'AccelerationStructure'?
  110 |     Nri(AccelerationStructureBits) flags;

AccelerationStructureVKDesc::flags is an AccelerationStructureBits, which is declared in NRIRayTracing.h. NRIWrapperD3D12.h already includes that header, so this does the same for the VK wrapper. The NriForwardStruct(AccelerationStructure) that stood in for the include is no longer needed. It was also a second typedef of the same name in C whenever both headers were included, which -std=c99 -pedantic warns about.

Checked with clang: the snippet above now compiles as C++17 and as C11 with -Wall -Wextra -Werror, in either include order, and every header in Include/Extensions compiles on its own after NRI.h.