always build wine dependencies as universal

Wine64 is not supposed to work on OS X, and Wine is always built 32-bit. Forcing users to pass the argument `--universal` when building wine is both misleading and a waste of time (since the user will typically try to install wine normally first, then see the build fail, and finally add the option). Instead, this patch removes the `--universal` option from Wine while making it look like it's always active from the point of view of the formula installer, so that all dependencies as marked as universal, as necessary for Wine to work.