Still needs to get passed for 10.6 and lower, right?

I think this has exceeded its readability as a one-liner, so how about breaking this out:

```ruby
if build.without?('ssse3') || MacOS.version <= :snow_leopard || (MacOS.version > :mountain_lion && Hardware::CPU.family == :haswell && Hardware::CPU.extmodel >= 4)
  args << '-no-ssse3'
end
```

Which is still really long!