[GCC-XML]Re-write prototype in CVS

[Brad King]

Dave,

> Let's see if I understand. The problem is that it would have to
> potentially search through the entire tree for elements labelled with
> that file, because the links in the data structure doesn't corresponds
> to the order in which source was read?
> 
> If so, that /does/ sound like it would make problems.

That is correct :(
There are some functions to do re-ordering, but it is really ugly, and
probably not worth the added complexity.

> Okay; that's absolutely critical for one of my two main applications
> of GCC-XML (documentation generation).
[snip]
> Looks as though you're tantalizingly close... ;-D

I'll try to find some time to add this support ASAP.  Once I find the
time, it shouldn't take too long.

-Brad