Change default location of EUDC options file

* NEWS: Document change to EUDC options file's default location.
* lisp/net/eudc-vars.el (eudc-options-file): Use
`locate-user-emacs-file' to change default options file location.

etc/NEWS

@@ -633,6 +633,9 @@ to avoid interfering with the kill ring.
 *** Custom variable `eudc-inline-expansion-format' defaults to
 "Firstname Surname <mail-address>".
 
+*** Custom variable `eudc-options-file' defaults to
+"~/.emacs.d/eudc-options".
+
 *** New custom variable `ldap-ldapsearch-password-prompt-regexp' to
 allow overriding the regular expression that recognizes the ldapsearch
 command line's password prompt.

lisp/net/eudc-vars.el

@@ -312,9 +312,11 @@ arguments that should be passed to the program."
 			:inline t
 			(string :tag "Argument")))))
 
-(defcustom eudc-options-file "~/.eudc-options"
+(defcustom eudc-options-file
+  (locate-user-emacs-file "eudc-options" ".eudc-options")
   "A file where the `servers' hotlist is stored."
-  :type '(file :Tag "File Name:"))
+  :type '(file :Tag "File Name:")
+  :version "25.1")
 
 (defcustom eudc-mode-hook nil
   "Normal hook run on entry to EUDC mode."