Merge pull request #924 from waywardmonkeys/implement-sched-yield

Implement stub for sched_yield().

src/library.js

@@ -6702,6 +6702,13 @@ LibraryManager.library = {
     return 0;
   },
 
+  // ==========================================================================
+  // sched.h (stubs only - no thread support yet!)
+  // ==========================================================================
+  sched_yield: function() {
+    return 0;
+  },
+
   // ==========================================================================
   // pthread.h (stubs for mutexes only - no thread support yet!)
   // ==========================================================================