disable some tests in qemu

Author: DOhlsson

test/sys/test_prctl.rs

@@ -1,5 +1,6 @@
 use nix::sys::prctl;
 
+#[cfg_attr(qemu, ignore)]
 #[test]
 fn test_get_set_subreaper() {
     let subreaper = prctl::get_child_subreaper().unwrap();
@@ -43,6 +44,7 @@ fn test_get_set_clear_mce_kill() {
     assert_eq!(mce, PR_MCE_KILL_DEFAULT);
 }
 
+#[cfg_attr(qemu, ignore)]
 #[test]
 fn test_get_set_pdeathsig() {
     use nix::sys::signal::Signal;