Essentially, something is attempting to build the Yosys EXE when you build libyosys.so now. With `ENABLE_PYTHON_CONFIG_EMBED=0`, the Yosys EXE will always fail to build.
Furthermore, because `ENABLE_PYOSYS` now attempts to build a wheel, building a wheel has become recursive.
This commit uses a supplementary set of libs for the EXE (EXE_LIBS) so it and libyosys.so can be built simultaneously, as well as a new Makefile flag, `ENABLE_WHEEL`, to prevent the aforementioned recursion.
I also enabled aarch64 Linux in the CI because it's publicly available now.
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