Sync OpenBSD patchset 480:
Sync OpenBSD patchset 480:

Double the escape timer (the time after a \033 is received before tmux gives up
waiting to see if it is part of a key sequence and passes it through) to 500
ms, the previous setting was too fast. Suggested by naddy.


klaxalk/tmux,klaxalk/tmux,klaxalk/tmux,klaxalk/tmux,klaxalk/tmux