0.9.10.24:

0.9.10.24:
	Fix (I think) the %INSTANCE-REF build problems on PPC and
	probably SPARC.
	... the CTYPE-OF failure came about because the system didn't
		know that (AND INSTANCE FUNCTION) was NIL.  Make it
		so...
	... and then delete a stale KLUDGE workaround in primtype.lisp
	... this then built as far as stream.lisp, where the problem
		was that (AND INSTANCE STREAM) was being "simplified"
		to just STREAM, and then primtype didn't know that
		STREAMs are subtypes of INSTANCE...
	... which in fact they're not; CLOS allows us to construct
		funcallable streams.  So...
	... instead teach the system that (AND INSTANCE STREAM)
		shouldn't be simplified...
	... but (AND INSTANCE FD-STREAM) should.
	... (also delete some crufty classoids: BASIC-STRUCTURE-CLASS
		and FUNCALLABLE-STRUCTURE-CLASS were never used)
	... tests for all the failing things in type.{before,after}-xc