process: resize stderr on SIGWINCH

Fixes: https://github.com/nodejs/io.js/issues/2219
PR-URL: https://github.com/nodejs/io.js/pull/2231


Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: Michaël Zasso <mic.besace@gmail.com>