<top level>
	* configure.in: Switch more things to use maybe dependencies.
	Rearrange a little.  Use GCC_TOPLEV_SUBDIRS.
	* configure: Regenerate.
	* Makefile.tpl: Switch more things to use maybe dependencies.
	* Makefile.in: Regenerate.

<config>
	* config/acx.m4: Introduce _GCC_TOPLEV_NONCANONICAL_BUILD,
	_GCC_TOPLEV_NONCANOICAL_HOST, _GCC_TOPLEV_NONCANONICAL_TARGET,
	GCC_TOPLEV_SUBDIRS.

From-SVN: r66932