[server] stop UDP datagrams with bad checksums from causing spurious wakeups

[Damjan Jovanovic]

On bug 5774 comments 38, 56/57 and 64/65, it was proven beyond any
doubt that a UDP datagram with a bad checksum causes readability
events to be signalled on wine and not on Windows.

While it is not 100% certain if this is the only cause of bug 5774, I
believe that this patch should be accepted simply because it makes
wine behave like Windows. Bug 5774 can remain open for a few more
months to see if anyone experiences further problems.

Changelog:
* Stop UDP datagrams with bad checksums from causing spurious wakeups
(which don't happen on Windows).

Damjan Jovanovic
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