Guard YGGDRASIL_RAPIDJSON_PYTHON_WRAPPER against redefinition #50

Job	Run time
build_conda_recipe (ubuntu-latest, 3.11, rattler)	2m 22s
build_conda_recipe (macos-latest, 3.11, conda)	5m 10s
build_conda_recipe (windows-latest, 3.11, rattler)	6m 42s
build_conda_recipe (windows-latest, 3.11, conda)	10m 19s
build_conda_recipe (ubuntu-latest, 3.11, conda)	4m 39s
build_conda_recipe (macos-latest, 3.11, rattler)	2m 54s
	32m 6s

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