0.pre7.48:

0.pre7.48:
	deleted remaining conditional-on-GENGC-feature stuff (except
		what's in Alpha, where I don't have an Alpha to test
		the changes on)
	did "egrep -i gengc" and removed what I found
	(deleted some byte code stuff too, instead of trying to
		selectively remove gengc conditionalization within it)
	removed UNUSED slot in SYMBOL: We don't have any bootstrapping
		issues at cross-compile time which require us to
		maintain the same layout in the target as in the host