Compilation fix for old GCC versions.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@42701 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/os2/bitmap.h

@@ -85,6 +85,13 @@ public:
 
     // Initialize with XPM data
     wxBitmap(const char* const* bits);
+#if defined (__GNUC__) && __GNUC__ < 3
+    // needed for old GCC
+    wxBitmap(char** data)
+    {
+        *this = wxBitmap(wx_const_cast(const char* const*, data));
+    }
+#endif
 
     // Load a resource
     wxBitmap( int             nId