Disable AppVeyor for dmd-cxx

[wilzbach]

No description provided.

[dlang-bot]

Thanks for your pull request, @wilzbach!

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[MartinNowak]

Let's try blacklisting instead
https://www.appveyor.com/docs/branches/

[wilzbach]

I tried that before, but maybe it didn't take immediate effect:

See also: #7595

[MartinNowak]

And while we're at it, let's remove the dummy Jenkinsfile as well.

[MartinNowak]

I tried that before, but maybe it didn't take immediate effect:

It's puzzling me how codecov and appveyor came up with the weird idea to configure in the repo and on their servers. Also why would it test anything if there is no appveyor config? Exactly because of this server-side default config nonsense, requiring us now to override it with a blacklist dummy :o.

One of the few things that Jenkins gets right.

[MartinNowak]

Not to mention AppVeyors weird login logic, where I have to select your account b/c they haven't thought of orgs beforehand.

[jacob-carlborg]

@MartinNowak @wilzbach it's possible to configure AppVeyor to not build if there's no appveyor.yml. It's on the General settings page further down, called Skip branches without appveyor.yml.