Log Message:
protobuf: updated to 3.17.0

Protocol Buffers v3.17.0

Protocol Compiler

Fix the generated source information for reserved values in Enums.

C++

Fix -Wunused-parameter in map<string, int> fields
Use byteswap.h when building against musl libc
Fix -Wundefined-inline error when using SharedCtor() or SharedDtor()
Fix bug where Descriptor::DebugString() printed proto3 synthetic oneofs.
Provide stable versions of SortAndUnique().
Make sure to cache proto3 optional message fields when they are cleared.
Expose UnsafeArena methods to Reflection.
Use std::string::empty() rather than std::string::size() > 0.