libUPB fix for recent protobuf versions #17
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I was trying to build this on NixOS with a recent protobuf version, but got failures. According to this issue, there have been changes with libUPB and protobuf, such that looking for gRPC libraries will fail with UPB targets not yet defined. A description of the issue and a temporary workaround were proposed here, which I added to SNFM.