Patch to fix parallel makes from H.J. Lu.

	* Makefile (all): Remove sub-all.
	(stmp-sub-all): New target. Renamed from sub-all.
	(info, texinfo): Also depend on stmp-sub-all.
	(clean): Also remove stmp*.
	(maintainer-clean): New target. Same as realclean.

From-SVN: r15263