* Makefile.in (distclean): Don't delete machine.h or system.h;

	they don't exist anymore.

	* Makefile.in (distclean): Don't delete autosave or backup files.
	(extraclean): New target; like distclean, but delete autosave
	and backup files too.

	* Makefile.in (srcdir): New variable, not fully implemented.
	(xmakefile): Turn -g and -O in CFLAGS into C_DEBUG_SWITCH and
	C_OPTIMIZE_SWITCH in C_SWITCH_SITE's definition.  Delete junk.cpp
	when done.
	* ymakefile (archlib): Variable definition deleted.  Run programs
	from ../lib-src directly, or use ${archlibdir}.
	(${etc}DOC): Run make-docfile from ${libsrc}, not ${archlib}.
	(${archlib}make-docfile, ${archlib}emacstool): Use ${libsrc}, not
	${archlib}.

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