Update web pages for cpplib's dependency generation improvements

[Joseph S. Myers]

On Sun, 21 Jan 2001, Neil Booth wrote:

> +  <li>The dependency generator has been improved, to incorporate all
> +      the features in <a href="../ml/gcc/1999-09n/msg00742.html">
> +      Tom Tromey's proposal</a> for improving it.

I think links to list archives need to use absolute URLs, since they
aren't included in the copy of the web pages on www.gnu.org.

-- 
Joseph S. Myers
jsm28@cam.ac.uk