build: use @file for library link command
build: use @file for library link command

This is to keep the command as short as possible, to avoid issues on
TravisCI, as discussed on #1295

MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3