Make libprotobuf symbols local on OSX (#8346) #9435
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@gnossen gave a great overview in grpc/grpc#24992 of the overall problem. If a python process using both protobuf _and_ another native library linking in libprotobuf frequently can cause crashes. This seems to frequently affect tensorflow as well: tensorflow/tensorflow#8394, tensorflow/tensorflow#9525 (comment) tensorflow/tensorflow#24976, tensorflow/tensorflow#35573, https://github.com/tensorflow/tensorflow/blob/v2.0.0/tensorflow/contrib/makefile/rename_protobuf.sh, tensorflow/tensorflow#16104 Testing locally this fixes both crashes when linking in multiple versions of protobuf and fixes `DescriptorPool` clashes as well (e.g. Python and Native code import different versions of the same message).
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This PR cherry-picks the fix from #8346 onto the 3.19.x branch. This fix was dropped by mistake due to a bug in our sync script.
Fixes #9395.