How to detect if d3dcompiler_47 is the Win10+ ver (that accepts typed UAV loads) or not

gistfile1.cpp

   // Check if we support D3D12 functionality by trying to compile a standalone root signature blob
   {
      static char const rootsig_code[] = "#define main \"RootFlags(0)\"";
      ID3D10Blob *blob=0;
      HRESULT hr = D3DCompileFunc(rootsig_code, strlen(rootsig_code), "source", NULL, NULL, "main", "rootsig_1_0", 0, 0, &blob, 0);
      if (SUCCEEDED(hr))
         can_compile_d3d12 = true;

      if (blob)
         blob->Release();
   }