HEADS UP: /bin and /sbin are now dynamically linked

I just committed a patch to change /bin and /sbin from statically to
dynamically linked. If you don't like the idea of using a dynamically
linked /bin and /sbin, now is the time to define NO_DYNAMICROOT in your
make.conf.

The reasons for doing so have been hashed over lots of times. But the
short of it:

1) Much smaller /bin and /sbin. On i386, /bin and /sbin are 33 MB static.
   Dynamically linked, they are only 4 MB.
2) Proper support for NSS. This will finally allow you to use NSS modules
   and get things like usernames in ls -l working for modules that are
   dynamically loaded.

-gordon