Makefile.tpl (build_alias, [...]): Use noncanonical equivalents.

	* Makefile.tpl (build_alias, host_alias, target_alias): Use
	noncanonical equivalents.
	* configure.in: Rename to...
	* configure.ac: ...this.  Update AC_PREREQ.  Prevent error for
	AS_FOR_TARGET.  Set build_noncanonical, host_noncanonical, and
	target_noncanonical.  Use them.  Rewrite removal of configure
	arguments for autoconf 2.59.  Discard variable settings.  Force
	program_transform_name for native tools.

	* Makefile.in: Regenerated.
	* configure: Regenerated with autoconf 2.59.

	* src-release (DEVO_SUPPORT, do-proto-toplev): Expect configure.ac.

	* acx.m4 (ACX_CHECK_INSTALLED_TARGET_TOOL): Avoid AC_PATH_PROG
	with an empty path.

From-SVN: r121751