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hadrian: Fix running stage0/bin/ghc with wrong package DB. Fixes #17468.

Alex Biehl requested to merge alexbiehl/ghc:issue-17468-hadrian-cabal-fix-wrong-package-db into master

This is a rebased version of !2160 (closed) mostly here to get CI results. In a discussion around static linking I agreed to take @nh2's work over while he is busy. Copy-in of the original MR description:

Fixes #17468 (closed) (Hadrian not telling Cabal that the ghc in stage0 must not use the global package db in stage0, but the one from stage1).

A fix for !780 (comment 237580) (lack of -no-global-package-db in the ghc-stage1 wrapper added in !780 (merged)) is also included.

Please see the commit message for full details.

Edited by Alex Biehl

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