Remove unused struct

Author: mu001999

library/std/src/sys/pal/sgx/net.rs

@@ -542,7 +542,4 @@ pub mod netc {
         pub sin6_flowinfo: u32,
         pub sin6_scope_id: u32,
     }
-
-    #[derive(Copy, Clone)]
-    pub struct sockaddr {}
 }

library/std/src/sys/pal/teeos/net.rs

@@ -364,9 +364,6 @@ pub mod netc {
         pub sin6_flowinfo: u32,
         pub sin6_scope_id: u32,
     }
-
-    #[derive(Copy, Clone)]
-    pub struct sockaddr {}
 }
 
 pub type Socket = UdpSocket;

library/std/src/sys/pal/xous/net/mod.rs

@@ -78,7 +78,4 @@ pub mod netc {
         pub sin6_flowinfo: u32,
         pub sin6_scope_id: u32,
     }
-
-    #[derive(Copy, Clone)]
-    pub struct sockaddr {}
 }