Inclusion of indirect `"LinkingTo"` dependencies in lockfile

Consider the following setup: Root package {tidyverse} `Imports` {readxl} `LinkingTo` {cpp11}.

In a lockfile generated as

```r
lockfile_create(
  "tidyverse",
  dependencies = list(
    direct = "Imports",
    indirect = "LinkingTo"
  )
)
```

Am I wrong to expect {cpp11} in there, irrespectively of whether my OS/repos setting supports binary installs?