Mark test using inet_ntoa as thread-unsafe#252
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I saw this failure in the CI for #250. I managed to trigger it locally on my Mac by looping that one test for a few dozen test runs.
This issue is explicitly called out in the BUGS section of the darwin
inet_ntoamanpage: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man3/inet_ntoa.3.htmlThis isn't a problem with glibc because inet_ntoa returns a thread-local string there but it is a problem for musl which also returns a static string.
Rather than trying to parse exactly what situations allow you to use this API with threads, I've just marked the test unconditionally thread-unsafe.
While I was touching this code, I also moved the win32 skip to a static skipif decorator, which is generally preferred over a runtime check in the test body.