0.7.7.12:

	fixing insufficient-DEFGENERIC-checking problem in my 0.7.7.10
		code (pointed out by APD on sbcl-devel)...
	...added APD test case to tests/clos.impure.lisp
	...added AUXP value to PARSE-LAMBDA-LIST return values
		everywhere
	...made CHECK-GF-LAMBDA-LIST check AUXP instead of just
		checking that AUX list is empty