Make "old esc mode" key timeout configurable

[Denis Vlasenko]

Hello,

I use "old ESC mode" where single ESC works after a delay.

I patched mc to look at KEYBOARD_KEY_TIMEOUT_US environment variable 
so that delay is configurable (instead of hardcoded 0.5 second one).

25 millisecond timeout works just fine on local ttys, serial lines,
and over ssh. So I am setting KEYBOARD_KEY_TIMEOUT_US=25000 in my
login scripts.

Patch is run tested for at two years now.
Please apply.
--
vda
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