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 2d026042952afd5d7f283838d06ed28a6013ea71)