message: Whitelist syscalls for 32-bit x86 Linux
  Should probably filter the args to this for the sake of proper
  sandboxing.
diff: @@ -117,7 +117,9 @@ static sock_filter filter[] = {
  // networking
  ALLOW_SYSCALL(poll),
  +#ifdef __NR_accept
  ALLOW_SYSCALL(accept),
  +#endif
  ALLOW_SYSCALL(setsockopt),
  ALLOW_SYSCALL(sendto),
  ALLOW_SYSCALL(recvfrom),
  @@ -131,6 +133,11 @@ static sock_filter filter[] = {
  #endif
  ALLOW_SYSCALL(rt_sigreturn),
  + // i386
  +#ifdef __NR_socketcall
  + ALLOW_SYSCALL(socketcall),
  +#endif
  +
  // Raspberry Pi (ARM)
  #ifdef __NR_set_robust_list
  ALLOW_SYSCALL(set_robust_list),
  