lib: allow long paths for require on Windows
https://github.com/nodejs/io.js/pull/1801 introduced internal fs methods to speed up require. The methods do not call path._makeLong like their counterpart from the fs module. This brings back the old behaviour.
Fixes: https://github.com/nodejs/io.js/issues/1990 Fixes: https://github.com/nodejs/io.js/issues/1980