Bring FBSD 7.X client back to life

Bring FBSD 7.X client back to life

Having been untested for quite some time, we had several
places that needed more conditionals to compile on FreeBSD 7.

Now we compile and start on 7.3-RELEASE, but have locking issues
under actual use.

It seems that we are also incompatible with the Heimdal 0.6.3 in
the base system -- aklog is unable to actually obtain the needed
credential when compiled against that kerberos implementation;
using MIT krb5 1.6.3 from ports works without incident.

FIXES 128612

Reviewed-on: http://gerrit.openafs.org/3548
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>
(cherry picked from commit 6040a4daa0b04085f18a8e232a1a99dc7cc36cf5)

Change-Id: I148dbb0c5d8485d6f8fecae7a2d59e07a1a4d02b
Reviewed-on: http://gerrit.openafs.org/3649
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>