windows: afsauthent.dll export afsconf_ functions

Export additional afsconf_ functions required for asetkey

Reviewed-on: http://gerrit.openafs.org/10069
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
(cherry picked from commit 370a41f6f64ff8c1c20586f984d4cb0293f2b0c3)

Change-Id: If28da8d836401e21df0b2f00f08b9240af2d417c
Reviewed-on: http://gerrit.openafs.org/10078
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
Windows: build UNIX asetkey

With roken and friends it is now possible to build the UNIX
asetkey on Windows.  Do so to reduce duplicate code.

Reviewed-on: http://gerrit.openafs.org/10070
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
(cherry picked from commit d03c81be76a1bca7c2f75d45b3059f55c9e28a33)

Change-Id: I3b6cb6cb50e32391d8b84bc6336cb46ac4cbeba3
Reviewed-on: http://gerrit.openafs.org/10079
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>