gtk+3.0 missing for x86 from binary repo

dino is trying to build gtk+3.0 for x86, because the binary package went missing:

• https://builds.sr.ht/~postmarketos/job/396873
• http://pkgs.postmarketos.org/packages?name=gtk%2B3.0&branch=master

It passed in CI (!1874), because CI just built gtk+3.0: https://gitlab.com/mimi89999/pmaports/-/jobs/966433249#L1206

Not sure what went wrong here, but for now I'll just disable dino for x86 to unblock bpo. I'll look into it on Sunday probably.