* Makefile.tpl: Introduce experimental top level bootstrap support.
	* Makefile.in: Regenerate.
	* configure.in: Introduce support for top level bootstrap.
	* configure: Regenerate.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@79515 138bc75d-0d04-0410-961f-82ee72b054a4