Guile CVS to build-aux and guile-readline.

	* HACKING: Note need for libtool >= 1.5.26.

	* config.rpath, build-aux/config.rpath: Updated to latest upstream
	version.

	* config.guess, config.sub: 2008-01-07 versions added to Guile
	CVS, to ensure that Guile developers are using new enough versions
	(in particular for AIX 6.1 support).