Windows: Export a few more functions to afsauthent and afsrpc

The following exports are added:

libafsauthent:
    afsconf_SetExtendedCellInfo
    afsconf_PickClientSecObj
    afsconf_SawCell
    ka_PrintBytes
    ka_KeyIsZero

libafsrpc;
    initialize_RXK_error_table

Those functions are referenced by the bos code.

Reviewed-on: http://gerrit.openafs.org/8154
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>
(cherry picked from commit d52398940d58ccdba4114a9975762f48cc24ad15)

Change-Id: Ibd4c63c1d8cbef77233d5d74bed057a48324368f
Reviewed-on: http://gerrit.openafs.org/10037
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>