0.8.8.21:

0.8.8.21:
	Make unknown variables signal a compile-time warning.
	... slightly hacky (if (eq kind :variable) ...) in the
		warning logic itself;
	... rearrange bits of the build to eliminate technically
		undefined forward references;
	... fix for multiple *CURRENT-CATCH-BLOCK* and
		*CURRENT-UNWIND-PROTECT-BLOCK*: we now have one and
		only one of each variable, rather than three