[distcc] PATCH bugfix for dcc_unlock()

[Sascha Demetrio]

Hi!

The current (2.18.3) implementation of dcc_unlock() is flawed, depending
on which lock implementation is selected. Closing the file descriptor
for unlocking works for flock() style locks, but not for locks acquired
through F_SETLK or lockf(), because these locks are associated with the
process, not the fd.

Here's a fix.

Kind regards,
Sascha

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