e93ff71 Add instructions for multi-processor gitian builds (Charlie Lee)
Pull request description:
This makes builds much faster if you have a multi-core machine.
Tree-SHA512: edb64c691a31a8a2e6c45f87886912d429a3fd600ebc0de2b16d44efd9d38bb92fea33c5fed207ad684b75d3247218912cab67661466a5538d534845e0808c9f