[hail] add make clean (#7237)
[hail] add make clean (#7237)

* [hail] add make clean

* fix makefile
g

danking/hail,cseed/hail,cseed/hail,cseed/hail,hail-is/hail,hail-is/hail,cseed/hail,danking/hail,cseed/hail,cseed/hail,danking/hail,hail-is/hail,hail-is/hail,danking/hail,hail-is/hail,cseed/hail,hail-is/hail,hail-is/hail,danking/hail,hail-is/hail,danking/hail,cseed/hail,danking/hail,danking/hail