We are testing that FD_CLOSE isn't generated, but Wine currently generates
FD_CLOSE anyway. However, sometimes Wine does not generate FD_CLOSE immediately,
causing the test to intermittently succeed inside the todo block.

This test is difficult to fix properly—it would involve either (arbitrary?)
buffering in the server, or support from the host OS.

However, we also don't want to make the Windows tests take longer, so add the
200 ms of leeway only on Wine.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=54073