fixed brokem build when EMBEDPLUGINS was off
fixed brokem build when EMBEDPLUGINS was off

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