[Chapel Merge] Fix fftw on the new CS system

Branch: refs/heads/master
Revision: 112101a
Author: ronawho
Log Message:

Merge pull request #16974 from ronawho/fix-cs-fftw

Fix fftw on the new CS system

We’re getting loader issues about not finding libfftw3.so.mpi31.3 on
the new CS system. Add the FFTW lib dir to LD_LIBRARY_PATH to resolve

Modified Files:
M util/cron/common-cray-cs.bash

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