Add wxOVERRIDE to test files

And cleanup some tailing spaces and tabs.

tests/graphics/affinematrix.cpp

@@ -121,7 +121,7 @@ public:
     {
     }
 
-    virtual void setUp()
+    virtual void setUp() wxOVERRIDE
     {
         m_bmpOrig = wxBitmap(m_imgOrig);
         m_bmpUsingMatrix.Create(m_bmpOrig.GetSize(), m_bmpOrig.GetDepth());

tests/graphics/bitmap.cpp

@@ -37,8 +37,8 @@ class BitmapTestCase : public CppUnit::TestCase
 public:
     BitmapTestCase() { }
 
-    virtual void setUp();
-    virtual void tearDown();
+    virtual void setUp() wxOVERRIDE;
+    virtual void tearDown() wxOVERRIDE;
 
 private:
     CPPUNIT_TEST_SUITE( BitmapTestCase );

tests/graphics/boundingbox.cpp

@@ -47,7 +47,7 @@ public:
         m_bmp = wxNullBitmap;
     }
 
-    virtual void setUp()
+    virtual void setUp() wxOVERRIDE
     {
         m_gcdc->ResetBoundingBox();
     }

tests/graphics/clippingbox.cpp

@@ -127,7 +127,7 @@ public:
     {
     }
 
-    virtual void setUp() { wxASSERT( m_dc ); }
+    virtual void setUp() wxOVERRIDE { wxASSERT( m_dc ); }
     virtual wxDC* GetDC(wxMemoryDC* dc) = 0;
 
 protected: