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mastodon: refactor passthru on source
Any attribute concatenation onto the result of mkDerivation will break
*some* overrideability.
This case is rather obscure. You'd have to do something like this to get
an eval failure:
```
(mastodon.override { srcOverride = mastodon.src.overrideAttrs { }; })
```
This is not what I'am actually doing: I am calling `overrideAttrs` on
every `callPackage` call for an experiment - and this break with it.