vol: Make VLockFile arguments consistent

vol: Make VLockFile arguments consistent

The Windows implementation of the VLockFile functions had the handle
incorrectly declared in a few places (they accepted a struct VLockFile
instead of an FD_t). Correct them, and make all VLockFile
implementation functions declare 'FD_t's instead of 'HANDLE's or
'int's.

Change-Id: I2bc414712599cb8f2a2f0a5034b583a15b2c3ad8
Reviewed-on: http://gerrit.openafs.org/4197
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>