fix py3 ci check

Author: yi.wu

paddle/scripts/paddle_build.sh

@@ -746,7 +746,7 @@ function main() {
         cmake_gen ${PYTHON_ABI:-""}
         build
         run_test
-        assert_api_not_changed
+        assert_api_not_changed ${PYTHON_ABI:-""}
         ;;
       *)
         print_usage