WinInet: Fix For Non-Thread-Safe gethostbyname

[Robert Shearman]

Hi,

The GetAddress function can sometimes cause an access violation because 
gethostbyname isn't thread-safe. We can work around this by not 
accessing the hostent returned outside of the critical section.

Rob

Changelog:
Make GetAddress safer by wrapping a critical section around 
gethostbyname and only accessing hostent where necessary.
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