Defsetf Lambda-Lists Don't Permit the &environment Parameter

[Shinmera]

This is in violation to 3.4.7 which specifically allows the &environment parameter in defsetf lambda-lists.

Test case:

(defsetf foo (&environment env place) (value))
;; => Bad lambda list  (&ENVIRONMENT ENV PLACE).

I'm not entirely sure if 3.4.7 requires &environment to come after the places, unlike other lambda-lists where &environment can be anywhere. In any case, late &environment also fails in the same fashion.

(defsetf foo (place &environment env) (value))
;; => Bad lambda list  (PLACE &ENVIRONMENT ENV).

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