Windows stats::st_mode and stat flags type.

[Lilit0x]

Synchronized the types of the st_mode property of the stat struct and the flags of the stat header file.

Fixes #3161

[rustbot]

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[bors]

☔ The latest upstream changes (presumably #3631) made this pull request unmergeable. Please resolve the merge conflicts.

[jogboms]

There are some unnecessary spaces here

[myl7]

Hi, I am the one who is working on the project to modernize the libc crate (Related: GSoC Idea GSoC Zulip).
I would like to ask that if I could rebase your commits to help merge them?

[tgross35]

This seems reasonable for a breaking change: relevant source is at https://github.com/microsoft/win32metadata/blob/9bde55b65e3ed63b0473c47c1ef1c5d359c48945/generation/WinSDK/RecompiledIdlHeaders/ucrt/sys/stat.h#L91, Amanieu approved already.

@Lilit0x please rebase then this should be good to go.

[tgross35]

Please run cargo fmt, then rebase and squash (to drop the merge commit)

@rustbot author

[jongiddy]

Bit flags are commonly expressed in octal or hexadecimal. Is there any reason to change to decimal here? Using hex would make it easier to confirm that the values are equivalent to other files that define these bitmasks.