[WIP] try to fix universal cairo under superenv

When building universal under superenv, cairo's configure script misdetects the presence of `__uint128_t`. This does not happen under stdenv.

The patch here forces it to pretend `__uint128_t` is not available (and also forces universal in order to make the build bot useful).

My guess is that the real problem has to do with how we set include paths and/or the difference handling of arguments when running under configure vs. running under make.

I'd like to get this working without the need for this hack.