0.6.12.48:

0.6.12.48:
	made ldb conditional on :SB-LDB in *FEATURES*. (Dan Barlow
		likes having the system stop on an ldb> prompt even
		when running as a batch program, but for me it's a
		nuisance. I want sh make.sh to terminate when it hits
		an error, period, since typically I make it beep when
		it's done. And since ldb isn't really appropriate for
		the problems that ordinary users have to deal with,
		it should be reasonable to suppress it by default,
		which is an overkill way to keep my system from
		stopping on an ldb> prompt.)
	more gencgc tidying..
	..hardwired enable_pointer_filter conditionalization to
		always be enabled
	..renamed the PTR() and Pointerp() macros to
		native_pointer() and is_lisp_pointer() inline
		functions