This commit adds basic arm64 support to the build. Building the bundled
openssl is disabled pending an upgrade to openssl 1.2, the currently
bundled version has some hand-rolled assembly that is 32 bits only.
PR-URL: https://github.com/iojs/io.js/pull/1028
Reviewed-By: Johan Bergström <bugs@bergstroem.nu>
Reviewed-By: Rod Vagg <rod@vagg.org>