message: Fixes flock(fd, LOCK_UN) emulation on Solaris.
  Follow up fix for
diff: @@ -406,7 +406,7 @@ mod sys {
  l_pad: [0, 0, 0, 0],
  };
  flock.l_type = if flag & libc::LOCK_UN != 0 {
  - libc::F_RDLCK
  + libc::F_UNLCK
  } else if flag & libc::LOCK_EX != 0 {
  libc::F_WRLCK
  } else if flag & libc::LOCK_SH != 0 {
  