clean up easyblocks to let CMakeMake they derive from set cmake option to specify Python paths
#3694
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When Python is used the CMakeMake easyblock already adds the required CMake options. As it has better logic to do so remove it from derived easyblocks.
There are 3 easyblocks (lammps, openbabel, root) that also set
PYTHON_LIBRARYandPYTHON_INCLUDE_DIR. The comment in lammps "older lammps" and "deprecated CMake" hints at FindPythonLibs, i.e.find_package(PythonLibs)where they are indeed required. So I left those there for now.