Fix for maintclean.test:

	Fix for maintclean.test:
	* tests/Makefile.am (XFAIL_TESTS): Removed maintclean.test.
	* lib/am/clean.am (distclean-generic): Don't remove config.cache
	or config.log.
	(distclean, maintainer-clean): Moved to...
	* lib/am/configure.am: ... here.
	(distclean): Remove config.cache and config.log.
	(maintainer-clean): Removed.
	(maintainer-clean-conf): New target.
	(maintainer-clean-am): New target.