Finish removing sunos 4.x references and build cruft

Finish removing sunos 4.x references and build cruft

Also, fix afsxbsa.h to always include <time.h> since this should get
struct tm on any fairly modern operating system.

Change-Id: Idfb39f12d28a2a0aa470c8549e4149d0b2ccde9e
Change-Id: Ia1c563e5954c533f18bd56155f2ae1825813efe3
Reviewed-on: http://gerrit.openafs.org/6923
Reviewed-by: Derrick Brashear <shadow@dementix.org>
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Tested-by: BuildBot <buildbot@rampaginggeek.com>