CMakeList: Add proper link library for using std::filesystem

2 jobs for correctExperimentLoadSave in 3 minutes and 13 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
failed mac #173621
MacOS

00:00:31

passed native_Debian_clang #173622
Debian

00:03:13

 
Name Stage Failure
failed
mac Build
/Users/wuttke/build/builds/7_AMyuSZ/0/mlz/nsxtool/core/data/DataSet.h:30:1: note: did you mean struct here?
class RawDataReaderParameters;
^~~~~
struct
1 warning generated.
make[1]: *** [core/CMakeFiles/nsxcore.dir/all] Error 2
make: *** [all] Error 2
Cleaning up file based variables
ERROR: Job failed: exit status 1