Function SzConfigTool_setMatchingFunction 

#[unsafe(no_mangle)]
pub extern "C" fn SzConfigTool_setMatchingFunction(
    config_json: *const c_char,
    rtype_code: *const c_char,
    matching_func: *const c_char,
) -> SzConfigTool_result

Set (update) a matching function (placeholder - not implemented)