since threading is not used. Disable it when clang is used.
since threading is not used. Disable it when clang is used.

danylaksono/openMVG,mojovski/openMVG,caymard/openMVG,Vinzza/openMVG,danylaksono/openMVG,openMVG/openMVG,Vinzza/openMVG,yoshidaken/openMVG,poparteu/openMVG,Vinzza/openMVG,Smozeley/openMVG,yoshidaken/openMVG,mojovski/openMVG,danylaksono/openMVG,poparteu/openMVG,openMVG/openMVG,mojovski/openMVG,poparteu/openMVG,caymard/openMVG,openMVG/openMVG,caymard/openMVG,Smozeley/openMVG,openMVG/openMVG,openMVG/openMVG,yoshidaken/openMVG,poparteu/openMVG,Smozeley/openMVG