Rollup merge of rust-lang#120332 - mu001999:cleanup/dead_code, r=Nilstrieb

Remove unused struct

Detected by rust-lang#118257

Author: matthiaskrgr

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

@@ -364,7 +364,4 @@ pub mod netc {
         pub sin6_flowinfo: u32,
         pub sin6_scope_id: u32,
     }
-
-    #[derive(Copy, Clone)]
-    pub struct sockaddr {}
 }