x/sys/windows: add NtSetInformationFile

[mou-hao]

Hi! When I was trying to implement a windows file handle based filesystem abstraction, I find NtSetInformationFile to be very useful used in conjunction with NtCreateFile. NtSetInformationFile supports file information classes not supported by SetFileInformationByHandle, for example FileDispositionInformationEx where you can use the FILE_DISPOSITION_POSIX_SEMANTICS flag to get posix stype delete.

The Microsoft doc for NtSetInformationFile can be found here: https://docs.microsoft.com/en-us/windows-hardware/drivers/ddi/ntifs/nf-ntifs-ntsetinformationfile

This should be a small change, as we already load ntdll.dll for NtCreateFile and more. I have already implemented it in another project. Use cases can be found here.

Thanks.

[ianlancetaylor]

Thanks. It's not necessary to make a proposal to add an existing Windows function to x/sys/windows. You can just send the CL.

[gopherbot]

Change https://golang.org/cl/355495 mentions this issue: windows: add NtSetInformationFile