Fix missing -lpthread
Fix missing -lpthread

YangYangTL/oiio,lgritz/oiio,micler/oiio,YangYangTL/oiio,YangYangTL/oiio,bdeluca/oiio,bdeluca/oiio,OpenImageIO/oiio,lgritz/oiio,bdeluca/oiio,micler/oiio,YangYangTL/oiio,micler/oiio,lgritz/oiio,bdeluca/oiio,lgritz/oiio,OpenImageIO/oiio,OpenImageIO/oiio,micler/oiio,OpenImageIO/oiio