ntpsec only used library_fatal_error(), so just hard code it.  The
old code tried to prevent recursion, but in this case could not
happen.

ntpsec only used library_unexpected_error(), so just hard code it.

Another layer of useless indirection.

Also change abort() to exit(-4).  abort() is being flakey.

yet another level of indirection.

Wow, a big circular rat's nest that was never used!