Rollup merge of rust-lang#137205 - thaliaarchi:remove-wasi-fileext-tell, r=alexcrichton

Remove `std::os::wasi::fs::FileExt::tell`

Following rust-lang#137165 (Use `tell` for `<File as Seek>::stream_position`), `tell` is now directly exposed via `stream_position`, making `<File as FileExt>::tell` redundant. Remove it.

`std::os::wasi::fs::FileExt::tell` is currently unstable and tracked in rust-lang#71213.

``@rustbot`` ping wasi

Author: Urgau

Diff for: std/src/os/wasi/fs.rs

@@ -162,13 +162,6 @@ pub trait FileExt {
         Ok(())
     }
 
-    /// Returns the current position within the file.
-    ///
-    /// This corresponds to the `fd_tell` syscall and is similar to
-    /// `seek` where you offset 0 bytes from the current position.
-    #[doc(alias = "fd_tell")]
-    fn tell(&self) -> io::Result<u64>;
-
     /// Adjusts the flags associated with this file.
     ///
     /// This corresponds to the `fd_fdstat_set_flags` syscall.
@@ -240,10 +233,6 @@ impl FileExt for fs::File {
         self.as_inner().as_inner().pwrite(bufs, offset)
     }
 
-    fn tell(&self) -> io::Result<u64> {
-        self.as_inner().as_inner().tell()
-    }
-
     fn fdstat_set_flags(&self, flags: u16) -> io::Result<()> {
         self.as_inner().as_inner().set_flags(flags)
     }