Increase LZ4 compression acceleration value to 20
Increase LZ4 compression acceleration value to 20

* This has minimal effect on compression ratio for a sample workload and a good
  improvement in compression speed.

baldurk/renderdoc,baldurk/renderdoc,baldurk/renderdoc,baldurk/renderdoc,baldurk/renderdoc,Zorro666/renderdoc,baldurk/renderdoc,Zorro666/renderdoc,Zorro666/renderdoc,Zorro666/renderdoc,Zorro666/renderdoc,Zorro666/renderdoc