Fix some custom types.

Fix some custom types.

* lisp/gnus/gnus-fun.el (gnus-x-face-omit-files, gnus-face-omit-files):
* lisp/gnus/gnus.el (gnus-valid-select-methods):
* lisp/mail/rmail.el (rmail-get-coding-function):
* lisp/net/newst-treeview.el (newsticker-groups-filename):
* lisp/progmodes/hideif.el (hide-ifdef-exclude-define-regexp):
* lisp/textmodes/tildify.el (tildify-space-predicates):
* lisp/url/url-tramp.el (url-tramp-protocols):
Fix custom types.