urlmon: IsValidUrl should not fail if first parameter is not NULL

[Dan Kegel]

Tests show that IsValidUrl ignores its first parameter
totally on Windows NT and 2000, and accepts
a valid bind context pointer (but not a random value)
on XP and higher.  So requiring it to be null is wrong.

This patch makes it ignore the first parameter,
adds conformance tests for non-null first parameter,
and lets Lost Saga's downloader work
( http://bugs.winehq.org/show_bug.cgi?id=26497 )
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