proposed patch: protos for warning(), error()

[Robert Lipe]

> 	I'm not liking the ugliness factor here.  Let's not jump
> through too many hoops and introduce too many oddities just to avoid
> some one time editing.

What we now have isn't too horrible.

> 	If you examine the current prototypes in tree.h/rtl.h, they
> already have much of the contents of the proposed toplev.h file except
> that fatal/error/warning are #ifdef'ed out.  I think this is because
> of the exact reason I gave regarding the conflicts with static copies
> of `fatal'.  Let's not enshrine this problem.

The pertinent part of one of those two files became toplev.h.

> 	I suggest that we "do the right thing".  I.e. include toplev.h
> only in those files which use one or more of the relevant functions,

It's drudgery I was hoping to avoid.    If we get a consensus that this
is the right thing to do, I'll do it.

I'm not unhappy with toplev.h as it now stands after rth's suggestions.

RJL