std: Ignore a flaky test on freebsd

This test runs successfully manually, but the bots are having trouble getting
this test to pass. Ignore it on freebsd for now.

Author: alexcrichton

src/libstd/io/net/tcp.rs

@@ -944,21 +944,26 @@ mod test {
 
         // Also make sure that even though the timeout is expired that we will
         // continue to receive any pending connections.
-        let (tx, rx) = channel();
-        spawn(proc() {
-            tx.send(TcpStream::connect(addr).unwrap());
-        });
-        let l = rx.recv();
-        for i in range(0, 1001) {
-            match a.accept() {
-                Ok(..) => break,
-                Err(ref e) if e.kind == TimedOut => {}
-                Err(e) => fail!("error: {}", e),
+        //
+        // FIXME: freebsd apparently never sees the pending connection, but
+        //        testing manually always works. Need to investigate this
+        //        flakiness.
+        if !cfg!(target_os = "freebsd") {
+            let (tx, rx) = channel();
+            spawn(proc() {
+                tx.send(TcpStream::connect(addr).unwrap());
+            });
+            let l = rx.recv();
+            for i in range(0, 1001) {
+                match a.accept() {
+                    Ok(..) => break,
+                    Err(ref e) if e.kind == TimedOut => {}
+                    Err(e) => fail!("error: {}", e),
+                }
+                ::task::deschedule();
+                if i == 1000 { fail!("should have a pending connection") }
             }
-            ::task::deschedule();
-            if i == 1000 { fail!("should have a pending connection") }
         }
-        drop(l);
 
         // Unset the timeout and make sure that this always blocks.
         a.set_timeout(None);