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* Build (grpc's) nanopb with -DPB_FIELD_16BIT
We require (at least) 16 bit fields. (By default, nanopb uses 8 bit
fields, ie allowing up to 256 field tags.)
Also note that this patch adds this to grpc's nanopb, rather than to our
nanopb. We'll need to eventually either:
a) we instruct grpc to use our nanopb
b) we rely on grpc's nanopb instead of using our own.
(^ marked as a TODO for now.)
* Add some dependant protos
Imported from protobuf. Nanopb requires these to be present (though
anything using libprotobuf does not, as these are already built into
that.)
* Add generated nanopb protos based off of newly added proto definitions
* Build the nanopb protos
* Serialize and deserialize null
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