A fix for rustc MacOS linking issue

[jeff-davis]

rust-lang/rust#66204

I filed that PR which would eliminate the need for the -unresolved dynamic_lookup to be specified for MacOS builds. Comments welcome.

[davidhewitt]

Unfortunately I see that ticket was closed, so I'm also going to close this one here.

It would be great to find a way to not need additional flags to build on MacOS. Please do keep us posted if you find a solution!