Function webkit2gtk_sys::webkit_context_menu_item_new_from_gaction

pub unsafe extern "C" fn webkit_context_menu_item_new_from_gaction(
    action: *mut GAction, 
    label: *const c_char, 
    target: *mut GVariant
) -> *mut WebKitContextMenuItem

This is supported on crate feature v2_18 only.