fix chia_bls build using subdir macro
fix chia_bls build using subdir macro

use preprocess cmd to create build dir and use subdir macro to define build dir


Former-commit-id: 5cf05ce09892bbcd4f7b2dea8a90fcec4f70090d
syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin