Pull in changes from HEAD
	* Makefile.in (target_cpu): Define.  Check for target_cpu rather than
	target_alias for conditional compilation issues.
	(toolopts): Change --target into --cpu option and use $target_cpu as
	argument.
	($(DEF_FILE)): Call gendef with $(target_cpu) as argument, rather than
	with $(target_alias).
	* gendef: Accommodate change from --target to --cpu option.
	* mkimport: Ditto.
	* speclib: Ditto.
	* Makefile.in (target_cpu): Define.  Check for target_cpu rather than
	target_alias for conditional compilation issues.
Pull in changes from HEAD
* configure.ac: Skip check for i686-w64-mingw32-g++ on x86_64.
* configure: Regenerate.