building an FS on arm

[btsimonh]

I use a modified version to build an FS, which I then use with nexe.
Just tried to create an image on RPi3, and it needed one change to the package,.json to install and run:

  "cpu": [
    "x64",
    "x86"
  ],

becomes:

  "cpu": [
    "x64",
    "x86",
    "arm"
  ],

this change may enable all features in a Raspbian build.
works nicely for me :).