Fix wrong value of FILE_FLAG_POSIX_SEMANTICS in Kernel32+CreateFileFl…

…ags.cs (dotnet#581)

* Fix wrong value of FILE_FLAG_POSIX_SEMANTICS in Kernel32+CreateFileFlags.cs

FILE_FLAG_POSIX_SEMANTICS is 0x01000000 by MSDN https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-createfilea#parameters
Value was incorrect FILE_FLAG_POSIX_SEMANTICS = 0x0100000.

* Fix PublicAPI

Co-authored-by: James Cheng <jameswccheng@gmail.com>
Co-authored-by: Andrew Arnott <andrewarnott@gmail.com>

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