Errors on x86_64 (broken c++ headers?)

[seth vidal]

> An easy way to deal with this would be adding exclude config setting
> into mach's per-root configuration and set exclude = *.i386 for all
> x86_64 roots, doesn't require much code. Or do you have something more
> sophisticated in mind?
> 

I'm working on removing sophistication, actually. Right now mach does
too much stuff that we don't need it to do. I'm removing functionality
intentionally to make handling it easier and less 'ugh'.

-sv