Re-enable networking module fo rL4Re

As suggested in the discussion of PR rust-lang#43972, std should provide a uniform API to all platforms. Since there's no networking on L4Re, this now is a module in `sys::net` providing types and functions/methods returning an error for each action.
TobiasSchaffner · Sep 6, 2017 · 9b3785f · 9b3785f
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diff --git a/src/libstd/lib.rs b/src/libstd/lib.rs
@@ -469,7 +469,6 @@ pub mod error;
 pub mod ffi;
 pub mod fs;
 pub mod io;
-#[cfg(not(target_os = "l4re"))]
 pub mod net;
 pub mod num;
 pub mod os;

diff --git a/src/libstd/sys/unix/ext/mod.rs b/src/libstd/sys/unix/ext/mod.rs
@@ -36,7 +36,6 @@ pub mod fs;
 pub mod process;
 pub mod raw;
 pub mod thread;
-#[cfg(not(target_os = "l4re"))]
 pub mod net;
 
 /// A prelude for conveniently writing platform-specific code.