[cmake] link option for clang with OpenMP support
[cmake] link option for clang with OpenMP support

poparteu/openMVG,openMVG/openMVG,poparteu/openMVG,poparteu/openMVG,poparteu/openMVG,openMVG/openMVG,openMVG/openMVG,openMVG/openMVG,openMVG/openMVG