Replace some obsolete functions in gnus

* lisp/gnus/mml-sec.el (mml-secure-epg-encrypt):
* lisp/gnus/smime.el (smime-ask-passphrase): Replace obsolete functions.

lisp/gnus/mml-sec.el

@@ -903,7 +903,7 @@ If no one is selected, symmetric encryption will be performed.  "
 (defun mml-secure-epg-encrypt (protocol cont &optional sign)
   ;; Based on code appearing inside mml2015-epg-encrypt.
   (let* ((context (epg-make-context protocol))
-	 (config (epg-configuration))
+	 (config (epg-find-configuration 'OpenPGP))
 	 (sender (message-options-get 'message-sender))
 	 (recipients (mml-secure-recipients protocol context config sender))
 	 (signer-names (mml-secure-signer-names protocol sender))

lisp/gnus/smime.el

@@ -234,10 +234,11 @@ must be set in `ldap-host-parameters-alist'."
 If `cache-key' and `password-cache' is non-nil then cache the
 password under `cache-key'."
   (let ((passphrase
-	 (password-read-and-add
+	 (password-read
 	  "Passphrase for secret key (RET for no passphrase): " cache-key)))
     (if (string= passphrase "")
 	nil
+      (and passphrase cache-key (password-cache-add cache-key passphrase))
       passphrase)))
 
 ;; OpenSSL wrappers.