* wesnoth-mode.el (wesnoth-parent-tag): Ignore #ifn?def.
(wesnoth-build-completion): No longer decrement position. Not necessary.
(wesnoth-complete-attribute): Updated for changes to
`wesnoth-build-completion'.
(wesnoth-complete-tag): Fix a bug where matching closing tags were not
found. Updated for changes to `wesnoth-build-completion'.
(wesnoth-check-element-type): Fix a bug where #ifndef was not ignored,
causing attributes never to be found, incorrect tags to be found. Removed
`last-tag' argument.
(wesnoth-check-wml): Updated for changes to `wesnoth-check-element-type'.
Minor output change.