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CURLMOPT_SOCKETFUNCTION(3) on macOS

The text 85a6db2ada96, as OS X 10.11.6, OS X 10.11.5, OS X 10.11.4, OS X 10.11.3, OS X 10.11.2, OS X 10.11.1, OS X 10.11, OS X 10.10.5 shipped it.

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CURLMOPT_SOCKETFUNCTION(3) on macOS now