virtual method hiding in GTK, so add direct implementation

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74294 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/bitmap.h

@@ -176,7 +176,6 @@ public:
     virtual bool Create(int width, int height, int depth = wxBITMAP_SCREEN_DEPTH) = 0;
     virtual bool Create(const wxSize& sz, int depth = wxBITMAP_SCREEN_DEPTH) = 0;
     // Create a bitmap compatible with the given DC, inheriting its magnification factor
-    virtual bool Create(int width, int height, const wxDC& dc);
 
     virtual int GetHeight() const = 0;
     virtual int GetWidth() const = 0;