[PATCH 2/2 v4] kernel32: Support MOVEFILE_WRITE_THROUGH / CopyFileExW progress

[Tom Watson]

Signed-off-by: Tom Watson <coder(a)tommywatson.com>
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v4
Added "optional" DWORD return value for WriteFile() to stop segfaults
General tidy up and temporarily removed failing tests that require updated
kernel32.dll