Replace "use vars" with "our"

[JRaspass]

Use of this pragma is discouraged in favour of "our" under 5.06+.

This dist already uses "our" elsewhere.

[simbabque]

Thanks a lot! Please add a Changes entry so the tests pass. Something like this will suffice.

{{$NEXT}}
    - Replace "use vars" with "our" (GH#34) (James Raspass)

[simbabque]

Thanks!