Remove unnecessary wxFontRefData dtor in wxOSX too

Smart pointers will clean up the resources automatically, there is no
need to call Free() manually from the dtor.

src/osx/carbon/font.cpp

@@ -47,8 +47,6 @@ public:
 
     wxFontRefData(CTFontRef font);
 
-    virtual ~wxFontRefData();
-
     float GetFractionalPointSize() const { return m_info.GetFractionalPointSize(); }
 
     wxFontFamily GetFamily() const { return m_info.GetFamily(); }
@@ -271,11 +269,6 @@ wxFontRefData::wxFontRefData(const wxFontInfo& info)
     SetEncoding(info.GetEncoding());
 }
 
-wxFontRefData::~wxFontRefData()
-{
-    Free();
-}
-
 void wxFontRefData::Free()
 {
     m_ctFont.reset();