added support for PROTOBUF_GENERATE_PYTHON_APPEND_PATH
added support for PROTOBUF_GENERATE_PYTHON_APPEND_PATH

NeoGeographyToolkit/MultipleViewPipeline,khusmann/MultipleViewPipeline,khusmann/MultipleViewPipeline,NeoGeographyToolkit/MultipleViewPipeline,NeoGeographyToolkit/MultipleViewPipeline,khusmann/MultipleViewPipeline,khusmann/MultipleViewPipeline,NeoGeographyToolkit/MultipleViewPipeline,NeoGeographyToolkit/MultipleViewPipeline,khusmann/MultipleViewPipeline