Stop flyspell claiming m-tab

flyspell{,-prog}-mode likes to take control of M-tab, which is a shame since that is usually bound to complete-symbol.

(setq flyspell-use-meta-tab nil)

doesn’t work, but:

    (eval-after-load "flyspell"
        '(progn
        (define-key flyspell-mode-map (kbd "M-TAB") nil)))

does.