OS X Homebrew Installation

This removes the current instructions for installing Homebrew
dependencies on OS X, particular the instructions around exercising the
—force command from inside Homebrew to link OpenSSL. This is
irresponsible and dangerous to advise, on several levels, and it’s also
completely unnecessary. The patch is borrowed from Litecoin, and
retains the attribution to the original author inside the document. The
patch is much *much* safer than the current suggested alternative.