I suspect the intent of this test was to verify that httpapi really doesn't bind
to that port. That HttpAddUrlToUrlGroup() fails implies this, but paranoia in a
case like this is rarely unwarranted.

However, this test cannot reliably succeed; some other operating system
component may open a TCP port in the meantime, and it appears that on Windows 10
this does in fact happen.

Since the goal of the test is just extra paranoia, I don't think it's worth
keeping.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=55127