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ARROW-17051: [C++] Link Flight/gRPC/Protobuf consistently (#13599)

If Protobuf/gRPC are used statically, Flight must be as well, or else we can get odd runtime behavior due to the global state in those libraries when Flight SQL is involved (as Flight SQL would then bundle a second copy of Protobuf into its shared library).

Authored-by: David Li <li.davidm96@gmail.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>