Bug#1015733: ghc: ABI reproducibility broken in 9.0.2

[Scott Talbert]

Package: ghc
Version: 9.0.2-3
Severity: serious
Justification: Policy 4.15

Haskell ABI reproducibility is broken in ghc 9.0.2.  If you rebuild the
ghc-9.0.2-3 package repeatedly, the library packages that it provides (e.g.,
libghc-array-dev, libghc-base-dev, etc.) will have different hashes.

Making this RC because it makes it impossible to rebuild the ghc package
without rebuilding all 1000+ Haskell packages at the same time.