Removed protections against user code redefining undefined

Jasmine hasn't even run on platforms that allowed redefining undefined
since 2.x.

src/core/asymmetric_equality/Anything.js

@@ -2,7 +2,7 @@ getJasmineRequireObj().Anything = function(j$) {
   function Anything() {}
 
   Anything.prototype.asymmetricMatch = function(other) {
-    return !j$.util.isUndefined(other) && other !== null;
+    return other !== undefined && other !== null;
   };
 
   Anything.prototype.jasmineToString = function() {