FreeBSD major version numbers are multi-character

FreeBSD major version numbers are multi-character

Do not assume that there is only a single character before the dot.

Reviewed-on: http://gerrit.openafs.org/8106
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>
(cherry picked from commit c4c51444ebd35fe0ceccde23512707ae693210ee)

Change-Id: I4b9016af301c4e9393e87fa59d6fa9d19dcd9843
Reviewed-on: http://gerrit.openafs.org/8342
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>
Tested-by: BuildBot <buildbot@rampaginggeek.com>