Get the typedefs of the module.

def c_typedefs(self):
        """Get the typedefs of the module."""
        defs = []
        attrs = self.opts.attrs + '\n' if self.opts.attrs else ''
        for name, args in self.funcs:
            logging.debug('name: %s args: %s', name, args)
            defs.append(
                'typedef\n{}\n{}{}({});\n'.format(
                    args[0], attrs,
                    self._c_type_name(name), make_c_args(args[2])
                )
            )
        return defs