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This adopts a patch from NetBSD's packaging fixing the `GhcThreaded` option of the make build system. In addition we introduce a `ghcThreaded` option in hadrian's `Flavour` type. Also fix Hadrian's treatment of the `Use Threaded` entry in `settings`. Previously it would incorrectly claim `Use Threaded = True` if we were building the `threaded` runtime way. However, this is inconsistent with the `make` build system, which defines it to be whether the `ghc` executable is linked against the threaded runtime. Fixes #17692.
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