Remove nconcq! macro

Unused and unnecessary.

core/autoload/files.el

@@ -108,11 +108,11 @@ be relative to it.
 The search recurses up to DEPTH and no further. DEPTH is an integer.
 
 MATCH is a string regexp. Only entries that match it will be included."
-  (let (file-name-handler-alist
-        result)
+  (let (result file-name-handler-alist)
     (dolist (file (mapcan (doom-rpartial #'doom-glob "*") (doom-enlist paths)))
       (cond ((file-directory-p file)
-             (nconcq! result
+             (appendq!
+              result
               (and (memq type '(t dirs))
                    (string-match-p match file)
                    (not (and filter (funcall filter file)))

core/core-lib.el

@@ -159,10 +159,6 @@ This is a variadic `cl-pushnew'."
   "Append LISTS to SYM in place."
   `(setq ,sym (append ,sym ,@lists)))
 
-(defmacro nconcq! (sym &rest lists)
-  "Append LISTS to SYM by altering them in place."
-  `(setq ,sym (nconc ,sym ,@lists)))
-
 (defmacro delq! (elt list &optional fetcher)
   "`delq' ELT from LIST in-place.