Python Binding Missing `/bigobj` for MSVC Compiler + External pybind11

[geometrian]

What it says on the tin. The compile for the python binding may fail under MSVC, when the pybind11 dependency is present externally, unless /bigobj is added. Note that in the event pybind11 is built internally, /bigobj is already added. (Credit also to Rémi Achard.)

See also ASF thread.