i386.c warnings cleanup

[Jeffrey A Law]

  In message < 19980210041543.12242@cerebro.laendle >you write:
  > comments appreciated ;)
As other folks noted, we're better off including the appropriate
files instead of declaring things like error, bcopy, free, etc.

When declarations are absolutely needed they should be wrapped
inside autoconf #ifdefs.

jfc made some fixes to the formatting strings in i386.md, so I
didn't install that part of your patch.  If we still need the
format change after both of your patches it can be resubmitted :-)

I installed the rest of the changes.  Thanks!

jeff