Additional synchronization is needed to ensure that the program
cannot modify the screen state while a line read is getting cancelled.
Also, we need to stop any pending reads *before* calling SetConsoleMode,
or a call to ReadConsole could start while the console is still in raw
mode.
Credit: @orangemocha - Alexis Campailla <orangemocha@nodejs.org>
Fixes: https://github.com/nodejs/node/issues/7837
PR-URL: https://github.com/libuv/libuv/pull/1054
Reviewed-By: Saúl Ibarra Corretgé <saghul@gmail.com>
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