[V] Support builtin functions in find-function (crash in C-h f)

[Aidan Kehoe]

 Ar an chéad lá de mí Bealtaine, scríobh Stephen J. Turnbull: 

 >     Aidan> On the subject of the veto--if I revert the patch in CVS now,
 >     Aidan> it’s never going in, because I can’t fix that crash with the
 >     Aidan> information I have.
 > 
 > XEmacs must not crash if we can help it, no matter how evil the data.

Well, the data here is data we create. It’s not even evil. 

 > If you think you have a fix within a day or so, that's one thing (even
 > if a day or so turns into a week or a month...).  But if you say you
 > can't fix it, it must come out, no?

It’s a platform-specific crash that happens on a platform I don’t have
access to. It’s probably not anything wildly complicated. Please, take a
minute, put a breakpoint on extract_object_file_name, tell me space_left has
a sane value and so does p and buffer. 

-- 
Aidan Kehoe, http://www.parhasard.net/