Auto merge of rust-lang#51553 - jD91mZM2:uds, r=sfackler

Unix sockets on redox

This is done using the ipcd daemon. It's not exactly like unix sockets because there is not actually a physical file for the path, but it's close enough for a basic implementation :)
This allows mio-uds and tokio-uds to work with a few modifications as well, which is exciting!

Author: bors

src/libstd/sys/redox/ext/mod.rs

@@ -33,6 +33,7 @@
 pub mod ffi;
 pub mod fs;
 pub mod io;
+pub mod net;
 pub mod process;
 pub mod thread;