testsuite: Add #[allow(structural_records)] to pipes tests

These will require a snapshot.

src/test/run-pass/pipe-detect-term.rs

@@ -14,6 +14,8 @@
 
 // xfail-win32
 
+#[legacy_records];
+
 extern mod std;
 use std::timer::sleep;
 use std::uv;

src/test/run-pass/pipe-peek.rs

@@ -10,6 +10,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#[legacy_records];
 
 extern mod std;
 use std::timer::sleep;

src/test/run-pass/pipe-pingpong-bounded.rs

@@ -17,6 +17,8 @@
 
 // This was generated initially by the pipe compiler, but it's been
 // modified in hopefully straightforward ways.
+#[legacy_records];
+
 mod pingpong {
     use core::pipes::*;
     use core::ptr;

src/test/run-pass/pipe-pingpong-proto.rs

@@ -12,6 +12,8 @@
 
 // An example to make sure the protocol parsing syntax extension works.
 
+#[legacy_records];
+
 use core::option;
 
 proto! pingpong (

src/test/run-pass/pipe-presentation-examples.rs

@@ -15,6 +15,7 @@
 // Code is easier to write in emacs, and it's good to be sure all the
 // code samples compile (or not) as they should.
 
+#[legacy_records];
 
 use double_buffer::client::*;
 use double_buffer::give_buffer;

src/test/run-pass/pipe-select.rs

@@ -13,6 +13,8 @@
 // xfail-pretty
 // xfail-win32
 
+#[legacy_records];
+
 extern mod std;
 use std::timer::sleep;
 use std::uv;

src/test/run-pass/pipe-sleep.rs

@@ -10,6 +10,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#[legacy_records];
 
 extern mod std;
 use std::timer::sleep;