Windows: disable Adv ICF support if not supported

Windows: disable Adv ICF support if not supported

OpenAFS 1.6.x does not require the use of SDK 6.0 or above.
Therefore the Advanced Internet Connection Firewall support
may not be available.  In particular, the 32-bit distribution
for 1.6.x does not rely on SDK 6.0 or higher.

This is a 1.6.x only change.

Reviewed-on: http://gerrit.openafs.org/6841
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@secure-endpoints.com>
Tested-by: Jeffrey Altman <jaltman@secure-endpoints.com>
(cherry picked from commit c533e10d2bb5d6f22ee54e2c43af06f13db037d1)

Change-Id: Id4269d2af010ac832ef17db8fb82e82409aab81b
Reviewed-on: http://gerrit.openafs.org/6842
Reviewed-by: Derrick Brashear <shadow@dementix.org>
Tested-by: Derrick Brashear <shadow@dementix.org>