suzerain: #2856 --as-needed for Makefile.ams

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suzerain: #2856 sane RPATH sans Intel runtimes

I think that these changes get sane-but-not-overlinked RPATH information into
the installed binaries and libraries.  That is, after installation I need only
run 'module load sl6 intel' for 'ldd bin/perfect_advance' to be able to resolve
all the dynamic libraries.

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