This removes the need to force it to build as C++, and adds proper UTF-8
support for Windows.
Since this is a fork of linenoise, there's no hope for getting
lua-linenoise to sync with it upstream. I made the bare minimum changes
to keep it working, but didn't add bindings for new functionality (e.g.
multi-line editing).
This effectively reverts b380514764 and
c24473ddff, restoring the state at
598cd52272.
Before pushing, please check that what you're about to push is sane.
Check your local commit log and ensure there isn't anything out-of-place
before pushing to mainline. When things like this happen, it wastes
everyone's time. I really don't need this in a week when real work™ is
busting my balls and I'm behind where I want to be with preparing for
MAME release.
