max: pd: fix that both message and audio processor factories were ins… #59
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…tantiated when only one is needed
This caused build errors due to some objects being rightfully incompatible with either backend.
To solve this, we defer instantation of the type inside a templated lambda, so that the
if constexpr
branch actually behaves with the expected template semantics, with the unused branch not being seen by template instantiation, unlike the previous case in a non-template function causing all branches to be instantiated even if optimized-out afterwards.