[LLVM] add wasm32 wheels #267
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This PR factors out the LLVM distro portion of the build of
mlir-python-bindings-wasm- i.e., it creates awasm32-empscriptenwheel/distro in addition to our current set of platforms. This is in preparation for #268 which will build out variousmlir-wgputhings on top of this distro.One tedious/weeds thing to call out: just building the distro via cross-compiling (using Emscripten's toolchain) didn't work because
find_package(Python3 Development)fails to successfully find Python dev libs. I believe it has something to do with CMP0190 but I couldn't debug it all the way. Butpyodide buildsucceeds (because it somehow isn't cross-compiling technically???) so that's good enough.In addition some drive-by cleanup (remove
macos-13from the GHA workflows).