grep-2.5.4-20080209b configure infrastructure

[Karl Berry]

I tried compiling the new test release at
http://alpha.gnu.org/gnu/grep/grep-2.5.4-20080209b.tar.gz with gcc 4.2.3
on CentOS 5.  configure gave this warning:

config.status: WARNING:  intl/Makefile.in seems to ignore the --datarootdir 
setting

... which is because gettext has apparently not been updated in a long
time.  I suggest using the latest official releases of gettext,
automake, and autoconf.

Best,
karl