message: Always create proxy buffers on D3D11 as just VB and IB
  * We don't use proxy buffers for anything else so it's safe to ignore other
  creation flags. This way we don't get problems with more flexible APIs like
  vulkan allowing buffer usage combinations that are illegal on D3D11.
diff: @@ -3531,25 +3531,9 @@ ResourceId D3D11Replay::CreateProxyBuffer(const BufferDescription &templateBuf)
  desc.CPUAccessFlags = 0;
  desc.MiscFlags = 0;
  desc.Usage = D3D11_USAGE_DEFAULT;
  - desc.BindFlags = D3D11_BIND_VERTEX_BUFFER;
  + desc.BindFlags = D3D11_BIND_VERTEX_BUFFER | D3D11_BIND_INDEX_BUFFER;
  desc.StructureByteStride = 0;
  - if(templateBuf.creationFlags & BufferCategory::Indirect)
  - {
  - desc.BindFlags = D3D11_BIND_SHADER_RESOURCE;
  - desc.MiscFlags |= D3D11_RESOURCE_MISC_DRAWINDIRECT_ARGS;
  - }
  - if(templateBuf.creationFlags & BufferCategory::Index)
  - desc.BindFlags = D3D11_BIND_INDEX_BUFFER;
  - // D3D11_BIND_CONSTANT_BUFFER size must be <= 65536 on some drivers.
  - if(desc.ByteWidth <= D3D11_REQ_CONSTANT_BUFFER_ELEMENT_COUNT * 16)
  - {
  - if(templateBuf.creationFlags & BufferCategory::Constants)
  - desc.BindFlags = D3D11_BIND_CONSTANT_BUFFER;
  - }
  - if(templateBuf.creationFlags & BufferCategory::ReadWrite)
  - desc.BindFlags = D3D11_BIND_UNORDERED_ACCESS | D3D11_BIND_SHADER_RESOURCE;
  -
  HRESULT hr = m_pDevice->CreateBuffer(&desc, NULL, &throwaway);
  if(FAILED(hr))
  {
  