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

[Aidan Kehoe]

 Ar an triochadú lá de mí Aibréan, scríobh Stephen J. Turnbull: 

 > VETO
 >
 > Start with xemacs -vanilla, C-h f rassoc RET, bye-bye XEmacs!
 > Repeatable.  

Not for me it isn’t. Have you regenerated your DOC file? Though, for me,
using an old doc file just signals an error, it doesn’t crash the process.

 > Revert the patch, no crash.

On the subject of the veto--if I revert the patch in CVS now, it’s never
going in, because I can’t fix that crash with the information I have.

 > By the way, there are changes in src/symbols.c and src/sysfile.h that
 > aren't in the ChangeLog.  I assume these are due to your commit.

They are; I had thought I had committed them already, because they weren’t
appearing in cvs diff for some reason. 

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