Windows: Fix i386_w2k and i386_nt40 path construction

Windows: Fix i386_w2k and i386_nt40 path construction

Now that DEST and OBJ are defined in terms of AFSROOT
do not DESTDIR and OJT in terms of AFSROOT.

Reviewed-on: http://gerrit.openafs.org/3025
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: Jeffrey Altman <jaltman@openafs.org>
(cherry picked from commit 6f3938e80a79a4a3684565a6960bce18e167aea4)
Change-Id: I4f084faaa5e058bb16045552135c70ac0a1683d3
Reviewed-on: http://gerrit.openafs.org/3122
Tested-by: Derrick Brashear <shadow@dementia.org>
Reviewed-by: Derrick Brashear <shadow@dementia.org>