FBSD: catch up to missing sysnames

FBSD: catch up to missing sysnames

Add sysnames for i386 and amd64 10.4, 11.1, and 12.0 (12-CURRENT, at present).

Reviewed-on: https://gerrit.openafs.org/12862
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
(cherry picked from commit c390f368a5012f866c1b4ce46d6ac6af6cef2fd5)

Change-Id: I5183c19d446fd0c00bd26c32ca3f7f00a4d12907
Reviewed-on: https://gerrit.openafs.org/12887
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>