This will bail before deleting the binaries if it can't connect to a
Docker host. Sometimes I build machine binaries when I haven't got a
machine and then it removes the machine binaries and then I can't
use machine to create a machine and then the universe implodes. :(
Signed-off-by: Ben Firshman <ben@firshman.co.uk>
With this change machine will still cross-compile for all supported OSes
/ archs by default, but allows user to customize args to the build
script.
Signed-off-by: Nathan LeClaire <nathan.leclaire@gmail.com>