Before this commit, the mere presence of files with certain names in local
package directories would make the build fail (see nonmodulefiles_test.go).
With this commit, we now record the buildinfo and buildid of all built Go
programs of this gokrazy instance.
related to https://github.com/gokrazy/gokrazy/issues/297
fixes https://github.com/gokrazy/gokrazy/issues/299
