[DOC PATCH] Add -Wunused-but-set-* note to gcc-4.6/changes.html and mention removal of <cstddef> in STL headers

[Matthias Klose]

On 10.03.2011 17:04, Jakub Jelinek wrote:
> +    default by <code>-Wall</code> flag and <code>-Wunused-but-set-parameter</code>
> +    by <code>-Wall -W</code> flags.</li>

-W is documented as "old option".  Maybe use -Wextra instead?

  Matthias