Windows: remove duplicate advapi32.lib references

Windows: remove duplicate advapi32.lib references

advapi32.lib is included in the conlibsdll macro.
No need to include it in the link list twice.

Reviewed-on: http://gerrit.openafs.org/3882
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: Jeffrey Altman <jaltman@openafs.org>
(cherry picked from commit 15c497e90edc69312dba6843521ff08f0ac19248)

Change-Id: Ibcd82014ca28e8ba0bec6e184bc5ae276a0eea90
Reviewed-on: http://gerrit.openafs.org/3914
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>