Don't split int64s when we don't need to

Don't split int64s when we don't need to

Now that we're always using an int64, and never a hyper_t, to represent
64bit integers, we can just print them out and assign them using the
native tools, rather than having to call SplitInt64. Simplify our code
to do so, which also avoids some gcc-4.6.0 warnings.

Change-Id: I12cfb5401d0431be2a4fefdfc5e1f52df7d5764d
Reviewed-on: http://gerrit.openafs.org/4998
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>