In a nutshell, remove all of this code.

I think it's really bizarre that comptime evaluation of Zig code can have any effect whatsoever on the compilation's link inputs. This should just not be Sema's job IMO. We like explicitness in Zig, so it's better for users to be explicit about their link inputs on the CLI or in build.zig anyway.

cc @andrewrk @mlugg