common: Make sure dotlock functions set a proper ERRNO.
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common: Make sure dotlock functions set a proper ERRNO.

* common/dotlock.c (map_w32_to_errno): New.
(read_lockfile): Return a proper ERRNO.
(dotlock_create_unix): Do not let log functions clobber ERRNO.
(dotlock_take_unix): Ditto.
(dotlock_release_unix): Ditto.
(dotlock_create_w32): Set proper ERRNO.
(dotlock_take_w32): Ditto.
(dotlock_release_w32): Ditto.