0.8.0.20:

0.8.0.20:
	Minor contrib infrastructure frob:
	... don't use :force t to ensure building, because firstly it's
	hideously expensive in time, as we have to build base systems
	several times; secondly, it won't work if the semantics change
	to not propagate the FORCE value to depended systems; and
	thirdly it doesn't work anyway in the presence of our current
	TEST-OP implementation.  Delete suspicious files (including
	*.fasl under contrib/) at the start of make-target-contrib.sh
	instead.
	... cvsignore contrib/systems