ghcup-hs
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Fix boot GHC for `ghcup compile ghc`
It turns out that passing ghcup compile ghc -b ghc-9.6.5
actually silently falls back to ghc
in PATH: https://gitlab.haskell.org/ghc/ghc/-/issues/24682
So we either have to:
- let the build fail and document that it needs to be an absolute path
- normalize it to an absolute path