Function annis_graphupdate_delete_node_label 

#[unsafe(no_mangle)]
pub extern "C" fn annis_graphupdate_delete_node_label(
    ptr: *mut GraphUpdate,
    node_name: *const c_char,
    anno_ns: *const c_char,
    anno_name: *const c_char,
    err: *mut *mut ErrorList,
)

Add “delete node label” action to the graph update object.

• ptr - The graph update object.
• node_name - Name of the node the label is attached to.
• annos_ns - Namespace of deleted new annotation.
• annos_name - Name of the deleted annotation.
• err - Pointer to a list of errors. If any error occurred, this list will be non-empty.