enable more tests on @mode/win
enable more tests on @mode/win

Summary:
Replace an <event2/util.h> include with <folly/portability/Event.h> so
mode/win is happy.

Reviewed By: genevievehelsel

Differential Revision: D36262213

fbshipit-source-id: ac90f929e725039c6c2b777bfd786253c398bb41

facebook/watchman,facebook/watchman,facebook/watchman,facebook/watchman,facebook/watchman,facebook/watchman,facebook/watchman,facebook/watchman,facebook/watchman