Remove EMACS_OUTQSIZE+sleep hack.
* dispnew.c (update_frame_1): Remove hack for terminals slower than 2400 bps, which throttled Emacs by having it sleep. This code hasn't worked since at least 2007, when the multi-tty stuff was added, and anyway those old terminals are long dead. * systty.h (EMACS_OUTQSIZE): Remove; unused. The macro isn't used even without the dispnew.c change, as dispnew.c doesn't include systty.h.
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