sys/socket.h: add new SO_ socket options from linux v5.11

see

  linux commit 7fd3253a7de6a317a0683f83739479fb880bffc8
  net: Introduce preferred busy-polling

  linux commit 7c951cafc0cb2e575f1d58677b95ac387ac0a5bd
  net: Add SO_BUSY_POLL_BUDGET socket option
1 file changed