* mpw-config.in: Adapt to work with autoconf'ed configury;

	* mpw-config.in: Adapt to work with autoconf'ed configury;
	build config.h, add empty definitions to mk.tmp.
	(powerpc-apple-macos): Make it work.
	* mpw-make.sed: New file, sed commands to translate Unix makefile
	into MPW syntax.
	* mpw-make.in: Remove.
	* mac-gdb.r: New file, was macgdb.r, renamed for consistency
	with other tools, now includes cfrg resource.
	* macgdb.r: Remove.
	* config/m68k/xm-mpw.h: Remove most of contents, replace with
	include of include/mpw/mpw.h.