OpenBSD: Add support for OpenBSD 4.8

OpenBSD: Add support for OpenBSD 4.8

Add param headers and other config info for OpenBSD 4.8
support.

Reviewed-on: http://gerrit.openafs.org/3748
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>
(cherry picked from commit be0e9fb703d9ca0ae17f1117cd53796f82d7fb30)

Change-Id: I03d4474d66d015126654d6d031a1870705733a41
Reviewed-on: http://gerrit.openafs.org/3922
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>