Revert "util: Add base64 from Heimdal's roken"

Revert "util: Add base64 from Heimdal's roken"

This reverts commit d552426b14d5f5befe74958a21bc9375d5312287.

util already has a base64.c, the Windows bits of this are half-baked,
and we need to find a config.h from somewhere so that this builds
cleanly.

Just back it out, until I can do it properly.

Change-Id: Iec3ef4579c8f83c7c00e03ad777489e287bbd2f3
Reviewed-on: http://gerrit.openafs.org/2909
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: Jeffrey Altman <jaltman@openafs.org>