Bring mumbleclean targets into conformance with GNU coding standards.

* Makefile.in (mostlyclean): New target.
	(clean): Just call mostlyclean.  Get rid of ../etc/DOC too.
	(distclean): Use clean to do most of the work.
	Get rid of ../etc/DOC-* too.
	(realclean): New target.

src/Makefile.in

@@ -28,17 +28,19 @@ all: doall
 doall: xmakefile
 	$(MAKE) ${SUBMAKEFLAGS} -f xmakefile ${MFLAGS} all
 
+mostlyclean:
+	rm -f temacs emacs prefix-args xmakefile* core \#* *.o libXMenu11.a
+	rm -f ../etc/DOC
+clean: mostlyclean
+	true
 #This is used in making a distribution.
 #Do not use it on development directories!
-distclean:
-	-rm -f paths.h config.h emacs-* temacs emacs xmakefile core *.o
-
-clean:
-	-rm -f temacs emacs prefix-args xmakefile* core \#* *.o libXMenu11.a
-
+distclean: clean
+	rm -f paths.h config.h emacs-* ../etc/DOC-*
+realclean: distclean
+	rm -f TAGS
 versionclean:
 	-rm -f emacs emacs-* ../etc/DOC*
-
 extraclean: distclean
 	-rm -f *~ \#* m/*~ s/*~