Linux 4.4: Use locks_lock_file_wait

Linux 4.4: Use locks_lock_file_wait

The locks API was changed in Linux 4.4, introducing locks_lock_file_wait
(e55c34a66f87e78fb1fc6b623b78c5ad74b475af) and removing
flock_lock_file_wait (616fb38fa7a9599293e05ae1fa9acfaf73922434).

locks_lock_file_wait can be used as a drop-in replacement so define
flock_lock_file_wait as an alias for it.

Reviewed-on: https://gerrit.openafs.org/12170
Reviewed-by: Mark Vitale <mvitale@sinenomine.net>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
(cherry picked from commit 58d82226a555d3781a5cb45e5cc177727628ebd8)

Change-Id: Icceae3906c1a612fb9104b860e519bb7f94d25d3
Reviewed-on: https://gerrit.openafs.org/12227
Reviewed-by: Michael Meffie <mmeffie@sinenomine.net>
Reviewed-by: Mark Vitale <mvitale@sinenomine.net>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>