mini-freeze of autotools-governed files in GCC and src

[Kaveh R. GHAZI]

On Sat, 22 Aug 2009, Ralf Wildenhues wrote:

> Freeze is over.  Thanks for your patience.

Thanks for your work on this!

> The trees have been updated to Autoconf 2.64 and Automake 1.11.  Please
> take a minute to ensure that you use these tools now when changing build
> system generated files;


Why request developers ensure this and not bump the AC_PREREQ to make
sure?