Set GCC 7 defines from CMake
Set GCC 7 defines from CMake

 Do this incase library is built with clang i.e., by homebrew

zbeekman/opencoarrays,zbeekman/opencoarrays,jerryd/opencoarrays,sourceryinstitute/opencoarrays,sourceryinstitute/opencoarrays,jerryd/opencoarrays,zbeekman/opencoarrays,sourceryinstitute/opencoarrays,jerryd/opencoarrays