When building with OpenMP support link to openmp lib
When building with OpenMP support link to openmp lib

See https://cliutils.gitlab.io/modern-cmake/chapters/packages/OpenMP.html

Signed-off-by: Ferry Toth <b7ff6f7d33f1b320413095ad62cad5fa92c49512@exalondelft.nl>

htot/base64,aklomp/base64,htot/base64,aklomp/base64,htot/base64,aklomp/base64