suzerain: remove ref to unused phantom

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suzerain: #2979 NRBC exposure

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suzerain: #2979 rethink API

Will be a touch less error prone this way.
Also, avoids naming collision details.

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suzerain: #2979 implicit NRBC acc. draft

Only updates the C99 routines and makes the C++ compile.
Doesn't do much interesting testing otherwise.

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