[pylauncher] Pass -X utf8 to python when using -E#27169
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Port the fix from a2bfe33 to pylauncher.c. This prevents the Python codepage from reverting from unicode to cp1252 on Windows when stdout/stderr is redirected. See: emscripten-core#26972
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dschuff
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Jun 23, 2026
sbc100
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This executable was pulled from the latest win32 build on the emscripten-releases waterfall: https://storage.googleapis.com/webassembly/emscripten-releases-builds/win/2650e4f60d08b155fbe8b01140ea1e8527cb55ac/wasm-binaries.zip This includes emscripten-core#27169, which I confirmed by running `strings -l` on the binary before and after.
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sbc100
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This executable was pulled from the latest win32 build on the emscripten-releases waterfall: https://storage.googleapis.com/webassembly/emscripten-releases-builds/win/2650e4f60d08b155fbe8b01140ea1e8527cb55ac/wasm-binaries.zip This includes #27169, which I confirmed by running `strings -l` on the binary before and after.
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Port the fix from a2bfe33 to pylauncher.c. This prevents the Python codepage from reverting from unicode to cp1252 on Windows when stdout/stderr is redirected.
See: #26972