review, proofing, and bug-fixing by Thomas Klausner (wiz):
1. add hifn(40 and ubsec(4) to share/man/man4/Makefile and the distrib set lists.
2. Restore commented-out cross-references to hifn(40 and ubsec(4) in crypto(4).
No change made to hifn.4 or ubsec.4; commit forced for cross-reference
and for pullup-request purposes.