0.6.12.7:

0.6.12.7:
	Make sure that we "mkdir output/" before we use it in the build
		process. (MNA pointed out that we used it before we
		made it.)
	Use "uname -m" to figure out sbcl_arch default.
	merged MNA PCL fixes from sbcl-devel 2001-05-09 (including
		port of Pierre Mai's method combination fixes from
		cmucl-imp 2001-04-26)
	added regression test for method combination fix
	Bug 14 was mostly fixed already: the problem with
		INVALID-METHOD-ERROR complaining about being outside
		a method combination function went away some time ago.
		The MNA/Mai patch above improves method combination
		error reporting further, so it's definitely time
		to retire 14 from BUGS.