deps: upgrade openssl to 1.0.2a

This just replaces all sources in deps/openssl/openssl to originals in
https://www.openssl.org/source/openssl-1.0.2a.tar.gz

Fixes: https://github.com/iojs/io.js/issues/589
PR-URL: https://github.com/iojs/io.js/pull/1389


Reviewed-By: Fedor Indutny <fedor@indutny.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>