Correct g++ version detection
Correct g++ version detection

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