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CURLOPT_LOW_SPEED_TIME(3) on macOS

The text e804a99fd0d9, as macOS 10.12.5, macOS 10.12.4, macOS 10.12.3, macOS 10.12.2, macOS 10.12.1, macOS 10.12 shipped it.

set low speed limit time period

CURLOPT_LOW_SPEED_TIME(3) on macOS now