[PATCH v2 0/1] MR8323: wow64win: Fix UNICODE_STRING thunking in wow64_NtUserRegisterWindowMessage.

[William Horvath (＠whrvt)]

The function was passing a 32-bit `UNICODE_STRING` pointer directly to the 64-bit
function, causing string corruption. Use the `unicode_str_32to64()` helper like other
similar functions.

This fixes 32-bit .NET Framework applications failing to create windows, such as
[dnSpyEx v6.5.1 (x86)](https://github.com/dnSpyEx/dnSpy/releases/tag/v6.5.1), when using a new-style WoW64 build.

Fixes: 73f4aeb2dcc33abd2f3ee02ee8fc1042d1998399

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  v2: wow64win: Fix UNICODE_STRING thunking in wow64_NtUserRegisterWindowMessage.

https://gitlab.winehq.org/wine/wine/-/merge_requests/8323