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That's the Arduino (Uno) library. If you've correctly installed the ESP8266 package then it should be 3.(something-ish) for the ESP8266 version of the WiFi library. Current is 3.1.1 for the core files, and the WiFi is part of the core libraries. If you have your compile options set for verbose then you should see it doesn't access that old Arduino WiFi library.
NOTE:
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Hence, a higher number means a more popular project.