repl: disable Ctrl+C support on win32 for now

Disable Windows support for interrupting REPL commands using
Ctrl+C by default, because the switches from console raw mode
and back have been interfering with printing the results of
evaluated expressions.

This is a temporary measure, since the underlying problem is
very likely not related to this specific feature.

Ref: https://github.com/nodejs/node/issues/7837

PR-URL: https://github.com/nodejs/node/pull/7977


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Nikolai Vavilov <vvnicholas@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: João Reis <reis@janeasystems.com>