Function gtk_sys::gtk_tool_palette_add_drag_dest

pub unsafe extern "C" fn gtk_tool_palette_add_drag_dest(
    palette: *mut GtkToolPalette, 
    widget: *mut GtkWidget, 
    flags: GtkDestDefaults, 
    targets: GtkToolPaletteDragTargets, 
    actions: GdkDragAction
)