Windows: add krb5_enctype_enable(DES) calls

Windows: add krb5_enctype_enable(DES) calls

Heimdal disables DES by default.  Enable DES-CBC-CRC by
calling krb5_enctype_enable() so that the active profile
does not require

[libdefaults]
allow_weak_enctypes = 1

Change-Id: I75d7b6bd7269081c7b1fcaafe05074dcdcc9a7e0
Reviewed-on: http://gerrit.openafs.org/5501
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: Jeffrey Altman <jaltman@openafs.org>