ignore c library build binary directory (#1731)
ignore c library build binary directory (#1731)


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