a few minor gold notes

[Tom Tromey]

I'm quite thrilled to see gold in the tree.

I think it deserves a note on the binutils web page.

Also I was wondering how I ought to report bugs for it.  I think there
should be a 'gold' component in bugzilla.

Finally, do you want bug reports for "missing" options?  For example,
I tried building gcc with gold in my path and the first problem was
that it does not implement --build-id.

thanks,
Tom