0.6.12.5:

0.6.12.5:
	made tests/foreign.test.sh more OpenBSD-friendly
	more Alpha patch tweaking..
	..removed extra "#define QSHOW 1" so that C-level
		describe_internal_error() becomes a debugging-only
		thing again
	..copied boilerplate text into the head of the new files
		(and moved some information from the head of the new
		files to CREDITS)
	..lotso cosmetic formatting changes
	..deleted src/compiler/alpha/print.lisp, since it's
		redundant with src/compiler/alpha/show.lisp
	..deleted "dead file" src/runtime/alpha-validate.h
	..removed in-the-flow-of-control EXPORTs and USE-PACKAGEs
		(in favor of centralized control in
		package-data.lisp-expr)