fix a few hundreds of harmless unused parameters warnings and a couple of real bugs discovered thanks to them

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@49659 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/mac/carbon/graphics.cpp

@@ -985,7 +985,7 @@ public :
     virtual void * GetNativePath() const { return m_path; }
 
     // give the native path returned by GetNativePath() back (there might be some deallocations necessary)
-    virtual void UnGetNativePath(void *p) const {}
+    virtual void UnGetNativePath(void *WXUNUSED(p)) const {}
 
     // transforms each point of this path by the matrix
     virtual void Transform( const wxGraphicsMatrixData* matrix );