Remove unused field.
Remove unused field.

micler/oiio,cwilling/oiio,mcanthony/oiio,YangYangTL/oiio,micler/oiio,lgritz/oiio,OpenImageIO/oiio,bdeluca/oiio,OpenImageIO/oiio,lgritz/oiio,cwilling/oiio,YangYangTL/oiio,scott-wilson/oiio,scott-wilson/oiio,lgritz/oiio,scott-wilson/oiio,sambler/oiio,scott-wilson/oiio,OpenImageIO/oiio,micler/oiio,sambler/oiio,bdeluca/oiio,sambler/oiio,mcanthony/oiio,sambler/oiio,mcanthony/oiio,YangYangTL/oiio,micler/oiio,YangYangTL/oiio,OpenImageIO/oiio,cwilling/oiio,lgritz/oiio,bdeluca/oiio,cwilling/oiio,mcanthony/oiio,bdeluca/oiio