[issue40280] Consider supporting emscripten/webassembly as a build target

[Christian Heimes]

Christian Heimes <lists at cheimes.de> added the comment:

Our config.sub agrees with LLVM:

$ ./config.sub wasm32-wasi
wasm32-unknown-wasi

The config.sub and config.guess scripts in main are recent enough for wasm. Just to be sure I created https://github.com/python/cpython/pull/29781 and plan to backport the changeset to 3.10 and 3.9. It's generally safe to update the files to latest version.

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