haskell.compiler.ghc9{6,8}: pass patched source to hadrian

We'll want to (slowly) unify the source used by the different
derivations we use to build GHC. As a first step, use the same base
source for building GHC and all hadrian related packages. This is
achieved by wrapping the fetcher result in `srcOnly` to apply GHC
patches immediately.

To modify the patches (and source) used by GHC we now have a changed
overriding interface for >= 9.6:

```
oldGhc.override {
  ghcSrc = oldGhc.src.overrideAttrs (oldAttrs: {
    src = …;
    patches = …;
  });
}
```

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