Add go://linkname annotation for lrita/numa

[geraldss]

I'm getting a link error building lrita/numa:

link: github.com/lrita/numa: invalid reference to runtime.gostringnocopy

Per #67401, please add an annotation for https://github.com/lrita/numa so that it can build with Go 1.23+.

[ianlancetaylor]

Sorry, but according to https://pkg.go.dev/github.com/lrita/numa that package is only imported by two other packages. That doesn't meet our criteria for locking down a runtime interface that nobody should ever use.

Also when I look at the current sources of that package, I don't see any reference to runtime.gostringnocopy. I do see a local copy of that function.

And with current Go it's also trivial to change the code to use unsafe.String instead.