link_tree: only remove matching files when unmerging
link_tree: only remove matching files when unmerging

krafczyk/spack,EmreAtes/spack,skosukhin/spack,matthiasdiener/spack,krafczyk/spack,iulian787/spack,LLNL/spack,tmerrick1/spack,iulian787/spack,krafczyk/spack,LLNL/spack,iulian787/spack,mfherbst/spack,LLNL/spack,iulian787/spack,matthiasdiener/spack,matthiasdiener/spack,EmreAtes/spack,mfherbst/spack,LLNL/spack,matthiasdiener/spack,tmerrick1/spack,skosukhin/spack,krafczyk/spack,skosukhin/spack,EmreAtes/spack,mfherbst/spack,EmreAtes/spack,LLNL/spack,iulian787/spack,mfherbst/spack,skosukhin/spack,EmreAtes/spack,matthiasdiener/spack,tmerrick1/spack,tmerrick1/spack,tmerrick1/spack,skosukhin/spack,mfherbst/spack,krafczyk/spack