PATCH: Dynamic /bin support

[Tim Kientzle]

> Tim posted this a while ago to hackers at .  It looked like it was
> further along than what's been posted here.


Just to clarify,  my /rescue patches are, in a sense,
orthogonal to what Gordon's doing here, although
they are an important part of getting to a fully-dynamic
system.

About six months ago, Nate Lawson and I had a
discussion with Luke Mewburn of NetBSD about
dynamic linking.  Luke outlined the following
strategy:

1) Get /rescue working.  This way, you'll
   be able to recover when you screw up badly. ;-)
   This is also an absolute prerequisite to
   getting wide support for a fully-dynamic system.

2) Double-check load path defaults in ld-elf.so.

3) Move critical libraries to /lib (with
    compatibility symlinks from /usr/lib, of
    course)

4) Implement a big knob for selecting
    fully-dynamic or "classic" system.

I've done the first part; it's just waiting
to get committed.  Gordon is working on step #3.

Gordon should also note that, in order to
get all of /bin and /sbin into /rescue, I
had to make a definitive list of required
libs.  Check out the Makefile, it's all
in there.

Tim