knot-resolver: add support for new DoH implementation
knot-resolver: add support for new DoH implementation

By default.  I'm not a DoH fan, but the difference in runtime closure
is really tiny (216 KiB by du).  I somehow forgot this during update.

Some of the newly running tests were failing and got disabled.

NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs