changing library options in optionlist does'nt trigger rebuild of depending thorns

I first built Cactus using OpenMPI shipped with the thorn MPI. Then I changed the optionlist to point to a local mpich2 installation and tried to rebuild Cactus using the new optionlist (sim build --thornlist=./thornlists/einsteintoolkit.th --optionlist=numrel-gcc.cfg). The new options are used in config-info and on the link line, however, thorns depending on MPI are not rebuilt, leading to link-failures because these thorns have been built against OpenMPI. Any change in the configuration of external libraries should lead to a rebuilt of depending thorns.

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