Fix improper initialization order for readline.
Turns out we must set rl_basic_word_break_characters *before* we call rl_initialize() the first time, because it will quietly copy that value elsewhere --- but only on the first call. (Love these undocumented dependencies.) I broke this yesterday in commit 2ec477dc; like that commit, back-patch to all active branches. Per report from Pavel Stehule.
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