ws2_32/tests: Update hostent struct tests

[Bruno Jesus]

* Added a final required test for the h->h_addr_list[0] to show we
must put it in the right place.
* Removed the cached use of older gethostbyname result since the
memory is static and turned into garbage in windows if the current
call fails.
* Added a skip if we hit older OS allowing we to avoid using broken()
on each test.
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