In the continuous effort to reduce the burden on GHC developers, some house cleaning has been done to delete dead code from GHC, and in particular: the code generation and runtime logic used by 32-bit macOS/iOS and Windows.
Read the article at Deprecation of 32-bit Darwin and Windows platforms — The Glasgow Haskell Compiler
Should you have any questions about the impact of this process, please contact your operating system vendor and/or contact the GHC development team on the ghc-devs mailing-list.