* configure.ac (target_tools): Remove target-groff.

	* configure.ac (target_tools): Remove target-groff.
	(native_only): Remove target-groff.
	(hppa*64*-*-*): Don't disable byacc.
	(i[[3456789]]86-*-mingw32*): Remove commented-out noconfigdirs
	setting.
	(*-*-kaos*): Don't skip target-librx and target-groff.
	(*-*-netware*): Don't skip target-libmudflap.
	(*-*-tpf*): Don't skip target-libmudflap.
	(sh*-*-pe|mips*-*-pe|*arm-wince-pe): Don't condition configured
	directories on the host.
	(ia64*-*-*vms*): Don't skip tix.
	(sh-*-* | sh64-*-*): Don't condition skipped directories on the
	host.
	* configure: Regenerate.