cmd/ddltest: fix build using 'go test -c' (#10535)
cmd/ddltest: fix build using 'go test -c' (#10535)


c4pt0r/tidb,kyle-wang/tidb,c4pt0r/tidb,qiuyesuifeng/tidb,Cofyc/tidb,coocood/tidb,kyle-wang/tidb,kyle-wang/tidb,ngaut/tidb,c4pt0r/tidb,pingcap/tidb,qiuyesuifeng/tidb,ngaut/tidb,pingcap/tidb,EvilMcJerkface/tidb,ngaut/tidb,pingcap/tidb,ming-relax/tidb,c4pt0r/tidb,pingcap/tidb,c4pt0r/tidb,kyle-wang/tidb,cosmtrek/tidb,coocood/tidb,ming-relax/tidb,cosmtrek/tidb,XuHuaiyu/tidb,Cofyc/tidb,c4pt0r/tidb,pingcap/tidb,ngaut/tidb,kyle-wang/tidb,ngaut/tidb,EvilMcJerkface/tidb,kyle-wang/tidb,XuHuaiyu/tidb,ngaut/tidb,pingcap/tidb