The upstream version of nasm does not put version information to the
generated object files, which makes linker to show the following
warning:

building for macOS, but linking in object file

Using own patched version of nasm which puts required information to
the object file, making linker happy.

The plan is to either streamline the patch and provide it to the
upstream, or, it that takes too long, get an independent fix from the
upstream.