- Add FL_SLEEP flag to indicate we intend to sleep and therefore desire
   to be placed on the block list.  Use it for POSIX & flock locks.
 - Remove locks_block_on.
 - Change posix_unblock_lock to eliminate a race that will appear once we
   don't use the BKL any more.
 - Update the comment for locks_same_owner() and rename it to
   posix_same_owner().
 - Change locks_mandatory_area() to allocate its lock on the stack and
   call posix_lock_file() instead of repeating that logic.
 - Rename the "caller" parameter to posix_lock_file() to "request"
   to better show that this is not to be inserted directly.
 - Redo some of the proc code a little.  Stop exposing kernel addresses
   to userspace (whoever thought _that_ was a good idea?!) and show how
   we should be printing the device name.  The last part is ifdeffed
   out to avoid breaking lslk.
 - Remove FL_BROKEN.  And there was much rejoicing.