* wl-message.el (wl-message-uu-substring): Suppress compile

* wl-message.el (wl-message-uu-substring): Suppress compile
warnings; Use `with-current-buffer' instead of `save-excursion' &
`set-buffer'.
* wl-mime.el (wl-draft-yank-current-message-entity)
(wl-mime-preview-follow-no-mime)
(wl-mime-preview-follow-current-region): Ditto.
* wl-summary.el (wl-summary-update-persistent-mark-on-event)
(wl-summary-switch-to-clone-buffer)
(wl-summary-target-mark-forward)
(wl-summary-target-mark-reply-with-citation)
(wl-summary-target-mark-uudecode): Ditto.