Windows: Add new token interface with stub for ktc_GetTokenEx

Windows: Add new token interface with stub for ktc_GetTokenEx

The Windows build was broken by the addition of dependencies on
token_FreeSet, ktc_GetTokenEx, etc.   Permit the build to continue.
The ktc_GetTokenEx implementation will depend on the creation of
a new Windows pioctl for the call.

Change-Id: I1c486af0beda10a2d846dc6bdff8c6195031dbe7
Reviewed-on: http://gerrit.openafs.org/2765
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>