Disable #[should_panic] test on Windows

We should re-enable this once
#1059 is fixed

test-cargo-miri/tests/test.rs

@@ -42,8 +42,13 @@ fn num_cpus() {
     assert_eq!(num_cpus::get(), 1);
 }
 
+
+// FIXME: Remove this `cfg` once we fix https://github.com/rust-lang/miri/issues/1059
+// We cfg-gate the `should_panic` attribute and the `panic!` itself, so that the test
+// stdout does not depend on the platform
 #[test]
-#[should_panic]
+#[cfg_attr(not(windows), should_panic)]
 fn do_panic() { // In large, friendly letters :)
+    #[cfg(not(windows))]
     panic!("Explicit panic from test!");
 }