So far we only did generate a newer eolian_gen binary here due to the
frequent changes, but we really need way more native tools when doing the
cross build. Edje_cc, eet and elm_prefs_cc to name them.
Maintaining a special target for these (when they need almost all of
efl/elm anyway) looks like a burden so we are going with a full efl
build. Still speeding it up quite a bit by disabling bindings, examples
and tests when dong the native tooling build.