/:
	PR bootstrap/45326
	PR bootstrap/45174
	* configure.ac: Honor initial values of $build_configargs,
	$host_configargs, $target_configargs.  Mark the precious, so
	environment settings get recorded.
	* configure: Regenerate.

gcc/:
	* doc/install.texi (Configuration): Document build_configargs,
	host_configargs, target_configargs.

From-SVN: r164904