CI: make a specific test for buildling with clang11 and C++17 (#3004)
CI: make a specific test for buildling with clang11 and C++17 (#3004)


OpenImageIO/oiio,OpenImageIO/oiio,OpenImageIO/oiio,OpenImageIO/oiio,lgritz/oiio,lgritz/oiio,lgritz/oiio,lgritz/oiio