func doInternalOne() string {
	return "doing internal one: " + oneSecret
}
doInternalOne is a function implemented in package one, but actually called
by package two using a go:linkname directive to gain access to it. Note:
dead-code elimination must be able to preserve this function.

This is a demonstration that an imported package can linkname a function
from an importer package.
package one
import (
	_ "unsafe"  
	"github.com/gopherjs/gopherjs/tests/testdata/linkname/three"
	"github.com/gopherjs/gopherjs/tests/testdata/linkname/two"
)
func DoOne() string {
	return "doing one"
}