split out iovec from sys_uio header

src/header/sys_socket/cbindgen.toml

@@ -1,6 +1,7 @@
-sys_includes = ["stddef.h", "stdint.h", "sys/types.h", "sys/uio.h"]
+sys_includes = ["stddef.h", "stdint.h", "sys/types.h"]
 include_guard = "_SYS_SOCKET_H"
 after_includes = """
+#include <bits/iovec.h> // for iovec
 #include <bits/socklen-t.h> // for socklen_t
 """
 trailer = "#include <bits/sys/socket.h>"

src/header/sys_socket/mod.rs

@@ -6,7 +6,7 @@ use core::{mem, ptr};
 
 use crate::{
     error::ResultExt,
-    header::{bits_socklen_t::socklen_t, sys_uio::iovec},
+    header::{bits_iovec::iovec, bits_socklen_t::socklen_t},
     platform::{
         PalSocket, Sys,
         types::{