kernel: correct CompareStringW

[Juan Lang]

As can be seen in the test results for WinXP (e.g. http://test.winehq.org/data/200605161000/xp_jave27-winxp-pro-sp2/kernel32:locale.txt), WinXP handles embedded NULLs differently than earlier versions.  I changed this to match the XP behavior because it impacts oleaut32.  It's still not entirely correct, so I'm leaving one test case todo_wine.  Partial fix for bug 5469.

ChangeLog: Use the WinXP method for comparing strings with embedded NULLs. Update tests.

--Juan

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