System cleanup

[Didier Verna]

  Hi,

I would like to remove some old workaround code from a couple of
systems, wrt to ASDF 3.1.4 bugs (see below). Is it safe to do so now, or
are these "bugs" still lurking around?

The relevant parts are as follows:

  :defsystem-depends-on
  (:net.didierverna.clon.setup/termio
   #+sbcl ;; BUG in ASDF 3.1.4: d-d-o can't deal dependency expanding to NIL
   (:feature :sbcl (:require :sb-grovel))
   #+(or allegro clisp lispworks)
   (:feature (:or :allegro :clisp :lispworks) :cffi-grovel))

and

  :components (;; bug in ASDF 3.1.4: cannot deal with conditionally defined
	       ;; component class!
	       #+sbcl (sb-grovel:grovel-constants-file "sbcl/constants"
		       :package :net.didierverna.clon :if-feature :sbcl)
	       #+(or allegro clisp lispworks)
	       (:cffi-grovel-file "cffi/constants"
		:if-feature (:or :allegro :clisp :lispworks))

Thank you!

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