What does warning “Mapping architecture arm64 to x86_64” mean?

Question

After migrating my framework to Xcode 10 beta (10L176w) I started to get warnings like:

Mapping architecture arm64 to x86_64. Ensure that this target\

Answer 1

I found the easiest way to resolve this was to open the project in my text editor, then find and delete all VALID_ARCHS lines.