volser: select() cannot be used to sleep on windows

volser: select() cannot be used to sleep on windows

On Windows must use Sleep() instead of select() with no
fd_set parameters.

Change-Id: I693718c74dd9be0b4eb58ec26afac0882845e71c
Reviewed-on: http://gerrit.openafs.org/3675
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Rod Widdowson <rdw@steadingsoftware.com>
Tested-by: Rod Widdowson <rdw@steadingsoftware.com>
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: Jeffrey Altman <jaltman@openafs.org>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Reviewed-by: Andrew Deason <adeason@sinenomine.net>