move wxBitmapComboBox dependency check to wx/chkconf.h where it belongs

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@41417 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/generic/bmpcbox.h

@@ -15,13 +15,8 @@
 
 #define wxGENERIC_BITMAPCOMBOBOX     1
 
-#if !wxUSE_ODCOMBOBOX
-    #error "Generic wxBitmapComboBox depends on wxOwnerDrawnComboBox"
-#endif
-
 #include "wx/odcombo.h"
 
-
 // ----------------------------------------------------------------------------
 // wxBitmapComboBox: a wxComboBox that allows images to be shown
 // in front of string items.
@@ -172,6 +167,4 @@ private:
     DECLARE_DYNAMIC_CLASS(wxBitmapComboBox)
 };
 
-
-#endif
-    // _WX_GENERIC_BMPCBOX_H_
+#endif // _WX_GENERIC_BMPCBOX_H_