Made selection of C++11 standard compatible with cmake 2.8.12
Made selection of C++11 standard compatible with cmake 2.8.12

Signed-off-by: Christoph Freundl <c807909aae2704e2fbc4b78ebdb2124469938b9c@ifm.com>

lovepark/libo3d3xx,lovepark/libo3d3xx