witr fails to cross build from source, because it depends on the host
architecture Go compiler which cannot be run. Since gccgo became
unsupported, we can narrow down the dependency from golang-any to
golang-go and since golang-go is a multitarget compiler, we can annotate
it :native to select a runnable compiler. What remains is a failure to
run the docgen tool. To fix that an additional native build pass is
needed. Please consider applying the attached patch.

Helmut