Function svn_path_url_add_component 

pub unsafe extern "C" fn svn_path_url_add_component(
    url: *const c_char,
    component: *const c_char,
    pool: *mut apr_pool_t,
) -> *const c_char

Like svn_path_url_add_component2(), but allows path components that end with a trailing ‘/’

@deprecated Provided for backward compatibility with the 1.5 API.