ProtocolBuffer通过pod导入常见问题

1、找不到头文件问题
https://github.com/protocolbuffers/protobuf/issues/1457

通过配置s.pod_target_xcconfig，来更改GCC_PREPROCESSOR_DEFINITIONS的值

  s.pod_target_xcconfig = { 'GCC_PREPROCESSOR_DEFINITIONS' => '$(inherited) GPB_USE_PROTOBUF_FRAMEWORK_IMPORTS=1' }

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