alnyan/yggdrasil: add update_metadata call

library/std/src/os/yggdrasil/io/mod.rs

@@ -19,3 +19,15 @@ pub mod terminal;
 pub use owned::*;
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use raw::*;
+
+#[unstable(feature = "yggdrasil_os", issue = "none")]
+pub use yggdrasil_rt::io::{FileMetadataUpdate, FileMetadataUpdateMode, FileMode as RawFileMode};
+
+#[unstable(feature = "yggdrasil_os", issue = "none")]
+pub fn update_metadata<P: AsRef<crate::path::Path>>(
+    path: P,
+    update: &FileMetadataUpdate,
+) -> crate::io::Result<()> {
+    let path = path.as_ref().to_str().unwrap();
+    crate::sys::cvt_io(unsafe { yggdrasil_rt::sys::update_metadata(None, path, &update) })
+}