Makefile: support cross-compile to linux (#12412)
Makefile: support cross-compile to linux (#12412)


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