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Hadrian: Stop using the in-tree Cabal

Andrey Mokhov requested to merge wip/andrey/external-cabal into master

The fact that Hadrian currently depends on the in-tree Cabal library has proven to be both slow and fragile (see #16259 (closed)). This MR proposes to revert to depending on a stable release of Cabal instead.

Pros:

  • This will make Hadrian faster to build if the (stable) Cabal library is shared with other projects on the same machine.
  • We don't need to adapt/rebuild Hadrian every time the in-tree Cabal library is changed. We will upgrade to a new Cabal version only when need be.
  • This will hopefully allow us to avoid issues like the one described in #16259 (closed).

Cons:

  • We will not be able to parse GHC's .cabal files if they use bleeding-edge features of Cabal. And arguably, they shouldn't.
Edited by Andrey Mokhov

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