Homebrew/homebrew — pull request #30618 by roryk (2014-07-02 19:12:52+00:00)
Title: Set prefer_64_bit to true for non-Mac systems.

Returning false for non-Mac systems was causing some problems with formula on non-Macs.

Homebrew/linuxbrew#93 is an example. I wasn't sure where to fix this behavior.