suzerain: #2856 install libsuzerain_p3dfft

Installation done to try to improve RPATH propagation.
Also tweak rpath details in other installed libraries.

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@44195 0bd85f0b-c151-43b9-a1e9-27231104551f