Remove cond!

Well, that was short lived, but pcase and pcase-let are superior and
already available.

core/core-lib.el

@@ -181,13 +181,6 @@ The order VALUES is preserved."
                   elt)
                ,list)))
 
-(defmacro cond! (&rest clauses)
-  "An anaphoric `cond', which stores the conditional value in `it'."
-  `(let (it)
-     (cond ,@(cl-loop for (cond . body) in clauses
-                      collect `((setq it ,cond)
-                                ,@body)))))
-
 (defmacro defer-until! (condition &rest body)
   "Run BODY when CONDITION is true (checks on `after-load-functions'). Meant to
 serve as a predicated alternative to `after!'."