build(python): Mark whether the current package is the LTS-CPU version

[stinodego]

It's a bit hacky, but this should do the job...

@orlp does this give you what you need?

[orlp]

Yes, that should help. Perhaps the filename should be something more descriptive than _build.py though.

[stinodego]

Yes, that should help. Perhaps the filename should be something more descriptive than _build.py though.

I assume you're going to include the vendored code for determining instruction sets in this module? Maybe it should be _cpu_check.py? Suggestions welcome.

I'm also fine with merging this and renaming it to something else when you add the actual implementation.