Add necessary inline implementation of Fl_SVG_Image::copy(void).

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.4@12620 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

FL/Fl_SVG_Image.H

@@ -127,6 +127,7 @@ public:
   Fl_SVG_Image(const char *filename, const char *svg_data = NULL);
   virtual ~Fl_SVG_Image();
   virtual Fl_Image *copy(int W, int H);
+  Fl_Image *copy() { return copy(w(), h()); }
   void resize(int width, int height);
   virtual void desaturate();
   virtual void color_average(Fl_Color c, float i);