Fix compilation with g++ 10
Created by: aroffringa
g++ 10 is slightly stricter on what headers to include. Test with e.g. "CXX=/usr/bin/g++-10 cmake ../".
Created by: aroffringa
g++ 10 is slightly stricter on what headers to include. Test with e.g. "CXX=/usr/bin/g++-10 cmake ../".