NumPy header files were required for building MLIR, however the NumPy C-API is never used. In other words, NumPy is not a build time dependency. `numpy`, the python package, is required at runtime for the python bindings tests. In particular the file `mlir/python/mlir/runtime/np_to_memref.py` and all tests which may use it. This commit removes the build time dependency, but the runtime dependency remains through the `requirements.txt` file. Co-authored-by: Erick Ochoa <erick@ceci-nest-pas.me>
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