only search for numpy when the numpy-include directory is not passed #297
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In the emscripten / wasm case we cannot call the default
find_package(NumPy ${NUMPY_REQUIRED_VERSION} REQUIRED)
since this tries to call a non-existing python executable for theemscripten-wasm32
platform (we only have a python library for that platform).Therefore we pass
NUMPY_INCLUDE_DIRS
explicitly when building for wasm.