The vendored uu-stat routed every non-Unix invocation to a stub that
printed "stat: unsupported on this platform" and exited 1, so the bash
tool's stat builtin was dead on native Windows even though it was still
advertised and registered.
Add a Windows-native backend that reimplements the GNU stat directives on
top of std::fs::Metadata, the windows_by_handle metadata extensions
(inode, hard-link count, and device via GetFileInformationByHandle), and
the Win32 volume APIs for --file-system mode. Permission bits, file type,
and timestamps are synthesized from Windows attributes; ownership fields
that have no Windows equivalent report 0/UNKNOWN. The format parser,
printer, and BSD-compat layer are now shared across platforms and Unix
behavior is unchanged.
Fixes#6723
roboomp
53e9753d23