Fix cfg's target_os

Author: pheki

src/unix/newlib/mod.rs

@@ -547,7 +547,7 @@ pub const IFF_ALTPHYS: ::c_int = IFF_LINK2; // use alternate physical connection
 pub const IFF_MULTICAST: ::c_int = 0x8000; // supports multicast
 
 cfg_if! {
-    if #[cfg(target_os = "horizon")] {
+    if #[cfg(target_os = "vita")] {
         pub const TCP_NODELAY: ::c_int = 1;
         pub const TCP_MAXSEG: ::c_int = 2;
     } else {