• NDK installation should run whenever it's not installed

    According to
    https://docs.saltstack.com/en/latest/ref/states/all/salt.states.cmd.html#should-i-use-cmd-run-or-cmd-wait,
    ndk installation will only try to run if the ndk was just downloaded.
    
    In the old implementation, if you succeed at downloading the ndk but fail to
    install it, subsequent highstates won't attempt to install the ndk because the
    downloaded file will be unchanged.
    edunham committed Mar 21, 2016