Add wxOVERRIDE to test files

And cleanup some tailing spaces and tabs.

tests/xml/xrctest.cpp

@@ -139,8 +139,8 @@ class XrcTestCase : public CppUnit::TestCase
 public:
     XrcTestCase() {}
 
-    virtual void setUp() { CreateXrc(); }
-    virtual void tearDown() { wxRemoveFile(TEST_XRC_FILE); }
+    virtual void setUp() wxOVERRIDE { CreateXrc(); }
+    virtual void tearDown() wxOVERRIDE { wxRemoveFile(TEST_XRC_FILE); }
 
 private:
     CPPUNIT_TEST_SUITE( XrcTestCase );