modularize…

pybind11.cmake
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			set(PYBIND11_PYTHON_VERSION ${AKANTU_PREFERRED_PYTHON_VERSION} CACHE INTERNAL "")

			package_declare(pybind11 EXTERNAL
			EXTRA_PACKAGE_OPTIONS ARGS "2.4.2;CONFIG" LINK_LIBRARIES pybind11::embed PREFIX pybind11
			DESCRIPTION "Akantu's pybind11 interface"
			SYSTEM AUTO third-party/cmake/pybind11.cmake
			DEPENDS PythonLibsNew
			EXCLUDE_FROM_ALL
			)

			package_add_third_party_script_variable(pybind11
			PYBIND11_VERSION "v2.4.2")
			package_add_third_party_script_variable(pybind11
			PYBIND11_GIT "https://github.com/pybind/pybind11.git")