Recursive symlink in InstallArea

I just noticed that after !79 (merged) we are getting huge binary ZIP files for Geant4 binaries because of a recursive symlink.

As the nightlies are dereferencing symlinks when creating the ZIP files, we get the same files over and over again. For example, after an lbn-install for a debug build I got 27GB in InstallaArea and after removing the duplicated files it got down to 724MB.