Eshell dependencies: Fix recent regressions

* lisp/dired.el (dired-insert-directory): Tweak bug#27817's ugly hack.

* lisp/eshell/em-ls.el: Refine 'require's.

* lisp/eshell/esh-opt.el: Require esh-util on behalf of its clients.

lisp/dired.el

@@ -1269,8 +1269,8 @@ If HDR is non-nil, insert a header line with the directory name."
 	 ;; as indicated by `ls-lisp-use-insert-directory-program'.
 	 (not (and (featurep 'ls-lisp)
 		   (null ls-lisp-use-insert-directory-program)))
-         (not (and (featurep 'eshell)
-                   (bound-and-true-p eshell-ls-use-in-dired)))
+         ;; FIXME: Big ugly hack for Eshell's eshell-ls-use-in-dired.
+         (not (bound-and-true-p eshell-ls-use-in-dired))
 	 (or (file-remote-p dir)
              (if (eq dired-use-ls-dired 'unspecified)
 		 ;; Check whether "ls --dired" gives exit code 0, and

lisp/eshell/em-ls.el

@@ -29,7 +29,8 @@
 (require 'cl-lib)
 (require 'esh-util)
 (require 'esh-opt)
-(eval-when-compile (require 'eshell))
+(require 'esh-proc)
+(require 'esh-cmd)
 
 ;;;###autoload
 (progn

lisp/eshell/esh-opt.el

@@ -33,6 +33,10 @@
 
 ;;; User Functions:
 
+;; Macro expansion of eshell-eval-using-options refers to eshell-stringify-list
+;; defined in esh-util.
+(require 'esh-util)
+
 (defmacro eshell-eval-using-options (name macro-args options &rest body-forms)
   "Process NAME's MACRO-ARGS using a set of command line OPTIONS.
 After doing so, stores settings in local symbols as declared by OPTIONS;