Add broken feature to old benchmarks (#1555)

Signed-off-by: Lucio Franco <[email protected]>

tokio-executor/benches/blocking.rs

@@ -1,3 +1,4 @@
+#![cfg(feature = "broken")]
 #![feature(test)]
 #![warn(rust_2018_idioms)]
 

tokio-executor/benches/threadpool.rs

@@ -1,3 +1,4 @@
+#![cfg(feature = "broken")]
 #![feature(test)]
 #![warn(rust_2018_idioms)]
 

tokio-executor/benches/threadpool_depth.rs

@@ -1,3 +1,4 @@
+#![cfg(feature = "broken")]
 #![feature(test)]
 #![warn(rust_2018_idioms)]
 

tokio-sync/benches/mpsc.rs

@@ -1,3 +1,4 @@
+#![cfg(feature = "broken")]
 #![feature(test)]
 #![warn(rust_2018_idioms)]
 

tokio-sync/benches/oneshot.rs

@@ -1,3 +1,4 @@
+#![cfg(feature = "broken")]
 #![feature(test)]
 #![warn(rust_2018_idioms)]
 

tokio/benches/latency.rs

@@ -1,3 +1,4 @@
+#![cfg(feature = "broken")]
 #![feature(test)]
 #![warn(rust_2018_idioms)]
 

tokio/benches/mio-ops.rs

@@ -1,5 +1,6 @@
 // Measure cost of different operations
 // to get a sense of performance tradeoffs
+#![cfg(feature = "broken")]
 #![feature(test)]
 #![warn(rust_2018_idioms)]
 

tokio/benches/tcp.rs

@@ -1,3 +1,4 @@
+#![cfg(feature = "broken")]
 #![feature(test)]
 #![warn(rust_2018_idioms)]