switch also the default implementation for read_vectored

Author: stlankes

Diff for: library/std/src/sys/pal/hermit/net.rs

@@ -175,23 +175,12 @@ impl Socket {
     }
 
     pub fn read_vectored(&self, bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
-        let mut size: isize = 0;
-
-        for i in bufs.iter_mut() {
-            let ret: isize =
-                cvt(unsafe { netc::read(self.0.as_raw_fd(), i.as_mut_ptr(), i.len()) })?;
-
-            if ret != 0 {
-                size += ret;
-            }
-        }
-
-        Ok(size.try_into().unwrap())
+        crate::io::default_read_vectored(|b| self.read(b), bufs)
     }
 
     #[inline]
     pub fn is_read_vectored(&self) -> bool {
-        true
+        false
     }
 
     fn recv_from_with_flags(&self, buf: &mut [u8], flags: i32) -> io::Result<(usize, SocketAddr)> {