Windows: Set NTDDI_VERSION when setting _WIN32_WINNT

Windows: Set NTDDI_VERSION when setting _WIN32_WINNT

Reviewed-on: http://gerrit.openafs.org/2866
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: Jeffrey Altman <jaltman@openafs.org>
(cherry picked from commit e9fafac6cba6e024f08e8743d60b7853a2940ba2)
Change-Id: I04ff519adef8f9050d29d3236a28a979bd6f734b
Reviewed-on: http://gerrit.openafs.org/2934
Reviewed-by: Asanka Herath <asanka@secure-endpoints.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>