src: fix NODE_DEPRECATED macro

The NODE_DEPRECATED macro was piggybacking on the V8_DEPRECATED macro
but that macro is silent unless V8_DEPRECATION_WARNINGS is defined,
something io.js doesn't do.  Ergo, no deprecation notices were being
issued.

PR-URL: https://github.com/iojs/io.js/pull/1565


Reviewed-By: Trevor Norris <trev.norris@gmail.com>