Fix for using "%undefine _auto_set_build_XX" casue error:
macro expansion did not return an integer: %{_auto_set_build_flags} ? "%{set_build_flags}" : ""
Signed-off-by: liyunfei <liyunfei33@huawei.com>
(cherry picked from commit 91eff2bd0a5a861be51f26c55ad8092acdf25a40)