Remove checks for wxNEEDS_CHARPP

wxNEEDS_CHARPP was needed only for now unsupported GCC versions.

include/wx/msw/bitmap.h

@@ -55,12 +55,6 @@ public:
 
     // Initialize with XPM data
     wxBitmap(const char* const* data);
-#ifdef wxNEEDS_CHARPP
-    wxBitmap(char** data)
-    {
-        *this = wxBitmap(const_cast<const char* const*>(data));
-    }
-#endif
 
     // Load a file or resource
     wxBitmap(const wxString& name, wxBitmapType type = wxBITMAP_DEFAULT_TYPE);