open any files, just return an kvm handle that we can use to some
of the functions.

to give them a larger timeslot to do that.
Requested by deraadt@ and various people on icb or vocally.

a.out stuff in link_aout.h and ELF stuff in link_elf.h.
Switch sparc64 back to MI link.h.
drahn@ ok (powerpc will switch soon).

millert@ ok

(this will warn if they are used without a terminating NULL pointer.
Note *pointer*, very useful for arches where 0 != (void *)0, in size)
okay millert@

decriptor -> descriptor
authentciated -> authenticated
transmition -> transmission

deraadt@ ok.

nobody.  While I do not like running things as nobody since the step
up is very small, we use this for other daemons in inetd.  And it is
still a small step.

From Dries Schellekens

active before /etc/pf.conf is loaded, just in case loading fails (and
leaves the inital set active). ok deraadt@

We could use skeyinfo(1) to check but this is much cheaper.

XXX libraries should not use atexit(3) from within, as program can terminate
with _exit.

suggested by deraadt@.

Tested by various people on various platforms, I'm willing to fix any
breakage this causes.
ok niels@ deraadt@ and mickey@ (after his comments were applied)

From Andr� Lucas <andre@ae-35.com>, fixes pr # 2658.
'Looks good' from miod@, millert@, and krw@.