Added config helper script for older cmake versions
Added config helper script for older cmake versions

This fixes the build issue https://travis-ci.org/DLR-SC/tigl/builds/73557563.

DLR-SC/tigl,DLR-SC/tigl,DLR-SC/tigl,DLR-SC/tigl,DLR-SC/tigl,DLR-SC/tigl