libusbx 1.0.14

There is already a pull request for libusbx 1.0.14:
https://github.com/mxcl/homebrew/pull/17186

However, the existing pull request has not been merged as it does not meet the homebrew standards for options. In addition to this "do test" seems incorrect as libusbx does not have libusb-config binary.

My pull request addresses the issues mentioned above.