* configure.in: Use mt-aix43 to handle *_TARGET defs,

	not mh-aix43.
	* config/mh-aix43: Delete, move to mt-aix43.
	* config/mt-aix43: New file.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@31303 138bc75d-0d04-0410-961f-82ee72b054a4