switch to the default implementation of write_vectored

Author: stlankes

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

@@ -225,17 +225,11 @@ impl Socket {
     }
 
     pub fn write_vectored(&self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
-        let mut size: isize = 0;
-
-        for i in bufs.iter() {
-            size += cvt(unsafe { netc::write(self.0.as_raw_fd(), i.as_ptr(), i.len()) })?;
-        }
-
-        Ok(size.try_into().unwrap())
+        crate::io::default_write_vectored(|b| self.write(b), bufs)
     }
 
     pub fn is_write_vectored(&self) -> bool {
-        true
+        false
     }
 
     pub fn set_timeout(&self, dur: Option<Duration>, kind: i32) -> io::Result<()> {