deps: fix openssl for MSVS 2015

Backports http://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=aab3560b65b9254d17770bb6fe3ca7edd7451429
from openssl upstream, to add support for Visual Studio 2015. This is
already included in the newer openssl 1.0.2.

Original commit message:

  e_os.h: limit _MSC_VER trickery to older compilers.

  PR: #3390

Original pull request:

  http://rt.openssl.org/Ticket/Display.html?user=guest&pass=guest&id=3390

This was ported to v0.10 in https://github.com/joyent/node/pull/25857

PR-URL: https://github.com/nodejs/node/pull/2843


Reviewed-By: rvagg - Rod Vagg <rod@vagg.org>
Reviewed-By: orangemocha - Alexis Campailla <orangemocha@nodejs.org>
Reviewed-By: bnoordhuis - Ben Noordhuis <info@bnoordhuis.nl>