CPUCoreBase: Default the virtual destructor

Source/Core/Core/PowerPC/CPUCoreBase.h

@@ -7,7 +7,7 @@
 class CPUCoreBase
 {
 public:
-  virtual ~CPUCoreBase() {}
+  virtual ~CPUCoreBase() = default;
   virtual void Init() = 0;
   virtual void Shutdown() = 0;
   virtual void ClearCache() = 0;