Remove redundant requires of 'custom'

* lisp/emacs-lisp/eieio-custom.el:
* lisp/htmlfontify.el:
* lisp/mwheel.el:
* lisp/net/eudc-vars.el:
* lisp/net/ldap.el:
* lisp/net/tramp-ftp.el:
* lisp/net/tramp-gvfs.el:
* lisp/progmodes/cwarn.el:
* lisp/progmodes/sql.el:
* lisp/savehist.el:
* lisp/textmodes/reftex.el:
* lisp/wid-browse.el: Don't require 'custom'; it is preloaded since
version 20.1.

lisp/emacs-lisp/eieio-custom.el

@@ -33,7 +33,6 @@
 (require 'eieio)
 (require 'widget)
 (require 'wid-edit)
-(require 'custom)
 
 ;;; Compatibility
 

lisp/htmlfontify.el

@@ -78,8 +78,6 @@
 
 ;;; Code:
 (eval-when-compile (require 'cl-lib))
-(require 'custom)
-;;  (`defgroup' `defcustom')
 (require 'cus-edit)
 
 (require 'htmlfontify-loaddefs)

lisp/mwheel.el

@@ -37,7 +37,6 @@
 ;; 'mwheel-down', but I cannot find a way to do this very easily (or
 ;; portably), so for now I just live with it.
 
-(require 'custom)
 (require 'timer)
 
 (defvar mouse-wheel-mode)

lisp/net/eudc-vars.el

@@ -27,8 +27,6 @@
 
 ;;; Code:
 
-(require 'custom)
-
 ;;{{{      EUDC Main Custom Group
 
 (defgroup eudc nil

lisp/net/ldap.el

@@ -33,7 +33,6 @@
 
 ;;; Code:
 
-(require 'custom)
 (require 'password-cache)
 
 (autoload 'auth-source-search "auth-source")

lisp/net/tramp-ftp.el

@@ -31,7 +31,6 @@
 (require 'tramp)
 
 ;; Pacify byte-compiler.
-(eval-when-compile (require 'custom))
 (defvar ange-ftp-ftp-name-arg)
 (defvar ange-ftp-ftp-name-res)
 (defvar ange-ftp-name-format)

lisp/net/tramp-gvfs.el

@@ -108,8 +108,6 @@
 (require 'url-util)
 
 ;; Pacify byte-compiler.
-(eval-when-compile (require 'custom))
-
 (declare-function zeroconf-init "zeroconf")
 (declare-function zeroconf-list-service-types "zeroconf")
 (declare-function zeroconf-list-services "zeroconf")

lisp/progmodes/cwarn.el

@@ -104,7 +104,6 @@
 
 ;;{{{ Dependencies
 
-(require 'custom)
 (require 'cc-mode)
 
 ;;}}}

lisp/progmodes/sql.el

@@ -232,7 +232,6 @@
 
 (require 'cl-lib)
 (require 'comint)
-(require 'custom)
 (require 'thingatpt)
 (require 'view)
 (eval-when-compile (require 'subr-x))   ; string-empty-p

lisp/savehist.el

@@ -47,8 +47,6 @@
 
 ;;; Code:
 
-(require 'custom)
-
 ;; User variables
 
 (defgroup savehist nil

lisp/textmodes/reftex.el

@@ -51,10 +51,6 @@
 ;;; Code:
 
 (eval-when-compile (require 'cl-lib))
-
-;; Stuff that needs to be there when we use defcustom
-(require 'custom)
-
 (require 'easymenu)
 
 (defvar reftex-tables-dirty t

lisp/wid-browse.el

@@ -28,7 +28,6 @@
 ;;; Code:
 
 (require 'easymenu)
-(require 'custom)
 (require 'wid-edit)
 
 (defgroup widget-browse nil