tests/eolian: remove eolian_decl test
Summary:
<q66> just remove decl.eo and remove the eolian_decl test; it's useless
<q66> the reason: it used to be testing some specific API, which got replaced with more generalized API that is now used everywhere in the tests, so that specific test no longer has a purpose
resolves some compile errors due to type conflicts
Reviewers: q66
Reviewed By: q66
Subscribers: cedric, committers
Tags: efl
Differential Revision: https://phab.enlightenment.org/D6773