Fix some byte-compilation warnings about subr-x

* lisp/term/haiku-win.el (require):
* lisp/replace.el (require):
* lisp/progmodes/elisp-mode.el (require):
* lisp/isearch.el (require):
* lisp/files.el (require): Require subr-x when compiling.

lisp/files.el

@@ -30,7 +30,8 @@
 
 (eval-when-compile
   (require 'pcase)
-  (require 'easy-mmode)) ; For `define-minor-mode'.
+  (require 'easy-mmode) ; For `define-minor-mode'.
+  (require 'subr-x))
 
 (defvar font-lock-keywords)
 

lisp/isearch.el

@@ -54,6 +54,7 @@
 ;;; Code:
 
 (eval-when-compile (require 'cl-lib))
+(eval-when-compile (require 'subr-x))
 
 ;; Some additional options and constants.
 

lisp/progmodes/elisp-mode.el

@@ -31,6 +31,7 @@
 (require 'cl-generic)
 (require 'lisp-mode)
 (eval-when-compile (require 'cl-lib))
+(eval-when-compile (require 'subr-x))
 
 (define-abbrev-table 'emacs-lisp-mode-abbrev-table ()
   "Abbrev table for Emacs Lisp mode.

lisp/replace.el

@@ -30,6 +30,7 @@
 
 (require 'text-mode)
 (eval-when-compile (require 'cl-lib))
+(eval-when-compile (require 'subr-x))
 
 (defcustom case-replace t
   "Non-nil means `query-replace' should preserve case in replacements."

lisp/term/haiku-win.el

@@ -24,6 +24,7 @@
 ;;; Code:
 
 (eval-when-compile (require 'cl-lib))
+(eval-when-compile (require 'subr-x))
 (unless (featurep 'haiku)
   (error "%s: Loading haiku-win without having Haiku"
          invocation-name))