fix num_cpus

Author: newpavlov

src/libtest/lib.rs

@@ -1192,12 +1192,6 @@ fn get_concurrency() -> usize {
         }
     }
 
-    #[cfg(target_os = "redox")]
-    fn num_cpus() -> usize {
-        // FIXME: Implement num_cpus on Redox
-        1
-    }
-
     #[cfg(target_os = "vxworks")]
     fn num_cpus() -> usize {
         // FIXME: Implement num_cpus on vxWorks
@@ -1220,7 +1214,8 @@ fn get_concurrency() -> usize {
         target_os = "ios",
         target_os = "linux",
         target_os = "macos",
-        target_os = "solaris"
+        target_os = "solaris",
+        target_os = "redox",
     ))]
     fn num_cpus() -> usize {
         unsafe { libc::sysconf(libc::_SC_NPROCESSORS_ONLN) as usize }