Robert Edmonds 1937ba946b protoc-c: Use FileDescriptorLegacy to obtain proto syntax version on protobuf >= 23.0
Use the newer "legacy" way of determining whether a file descriptor is
using proto2 or proto3 syntax on protobuf >= 23.0.

Based on
66574f3fd8
but continues to support older versions of protobuf.

Unfortunately, since this is a "deprecated", "legacy" API it'll probably
disappear in about five seconds.
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