[flang-commits] [flang] [Flang][Windows] Fix test_errors.py by enforcing UTF-8 encoding (PR #134625)

[Leandro Lupori via flang-commits]

https://github.com/luporl approved this pull request.

LGTM.

The error message tested in `Semantics/OpenMP/interop-construct.f90` uses a special char for `fi`, in the word `specified`, which is probably a typo and should be fixed too.

https://github.com/llvm/llvm-project/pull/134625