tools: update gyp to b3cef02

Includes two patches for AIX. Adds support for both 32-bit and 64-bit
files[0] and uses -RPf for cp instead of -af (which is unsupported)[1]

[0] https://codereview.chromium.org/1319663007
[1] https://codereview.chromium.org/1368133002

PR-URL: https://github.com/nodejs/node/pull/3487


Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Shigeki Ohtsu <ohtsu@iij.ad.jp>