config.guess and config.sub in grep-2.5.4-20080209b.tar.gz

[Dan Nicolaescu]

config.guess and config.sub included in
 http://alpha.gnu.org/gnu/grep/grep-2.5.4-20080209b.tar.gz

are out of date (from 2005-07-08), please update to the latest version
from the master site.