Help needed: fix build issue with xdxf_makedict in older platforms

[Joshua Root]

On 2017-11-7 19:27 , Ken Cunningham wrote:
> 
> So my usual machine is 10.6.8, set up with LibcxxOnOlderSystems, and default compiler is presently clang-3.9.
> 
> With that, it built straight through without any trouble:
> 
> $ port -v installed xdxf_makedict
> The following ports are currently installed:
>  xdxf_makedict @0.4.1-beta1-20171015_0 (active) platform='darwin 10' archs='x86_64' date='2017-11-07T00:21:38-0800'

Differences in the internals of the headers for libc++ could easily make
it immune to this problem. And that's consistent with the problem not
showing up on 10.9 and later.

- Josh