Improve bat scripts for CCompilerOverride #10224
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This PR improves the CCompilerOverride bat scripts so that they point to the gcc or clang shipped with GHC, and not try to find one on the system. CI happens to have one installed but the user might not (see why one would do that in the warning in this section https://cabal.readthedocs.io/en/latest/how-to-run-in-windows.html#ensure-that-cabal-can-use-system-libraries)