master updated (8db72a8d4b7 -> 8b36bfc553b)

[Paul Eggert]

eggert pushed a change to branch master.

      from  8db72a8d4b7 Replace some EQ with BASE_EQ
       new  cbacdca9e3f Fix unlikely lock file integer overflow
       new  4b6b9a7acdc Avoid some GC when locking/unlocking files
       new  775fa8443fa Refactor current_lock_owner
       new  8b36bfc553b Remove empty (& invalid) lock files


Summary of changes:
 src/filelock.c | 218 +++++++++++++++++++++++++++++++--------------------------
 1 file changed, 119 insertions(+), 99 deletions(-)