main/gnutls: package guile bindings

I want to use guile bindings to gnutls in one of the packages I'd like to submit. I'm enabling guile bindings here to use gnutls-guile.

This MR will fail in CI stage since default_dbg tries to use objdump on guild object code.

If I use || continue here in abuild, to skip this issue, the the package is able to build.

I am not sure whether it's gnutls (my) issue, default_dbg issue, or abuild issue. I don't know of the consequences of using || continue there; so I'm open to suggestions.