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

Change-Id: I831cea711067d04dc276deb171faf3369c55b775
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>