Nix more uses of default-FOO variables (Bug#24946)

* lisp/cedet/semantic/util-modes.el (semantic-stickyfunc-mode):
Check for header-line-format instead.
* lisp/emulation/viper.el (viper-load-custom-file): Reference
major-mode instead.
* lisp-mail-feedmail.el (feedmail-fill-to-cc-fill-column): Use
fill-column instead.

lisp/cedet/semantic/util-modes.el

@@ -712,7 +712,7 @@ minor mode is enabled."
 	  ;; Disable minor mode if semantic stuff not available
 	  (setq semantic-stickyfunc-mode nil)
 	  (error "Buffer %s was not set up for parsing" (buffer-name)))
-	(unless (boundp 'default-header-line-format)
+	(unless (boundp 'header-line-format)
 	  ;; Disable if there are no header lines to use.
 	  (setq semantic-stickyfunc-mode nil)
 	  (error "Sticky Function mode requires Emacs"))

lisp/emulation/viper.el

@@ -1234,7 +1234,7 @@ These two lines must come in the order given."))
 (if (null viper-saved-non-viper-variables)
     (setq viper-saved-non-viper-variables
 	  (list
-	   (cons 'default-major-mode (list (default-value 'major-mode)))
+	   (cons 'major-mode (list (default-value 'major-mode)))
 	   (cons 'next-line-add-newlines (list next-line-add-newlines))
 	   (cons 'require-final-newline (list require-final-newline))
 	   (cons 'scroll-step (list scroll-step))

lisp/mail/feedmail.el

@@ -504,7 +504,7 @@ as-is.  The filling is done after mail address alias expansion."
   )
 
 
-(defcustom feedmail-fill-to-cc-fill-column default-fill-column
+(defcustom feedmail-fill-to-cc-fill-column (default-value 'fill-column)
   "Fill column used by `feedmail-fill-to-cc'."
   :group 'feedmail-headers
   :type 'integer