DOSBox-X: licence and source

Airtime runs in DOSBox-X, which is free software under the GNU General Public
License version 2 (COPYING, beside this file). The game itself is a separate
program that DOSBox-X runs; it is not covered by that licence.

This package's DOSBox-X: DOSBox-X 2026.10.01, upstream's own macOS build, unmodified.

Its complete source:
  https://github.com/joncampbell123/dosbox-x/tree/dosbox-x-v2026.10.01
  and the file dosbox-x-v2026.10.01.tar.gz (sha256 df023a6c0e4a139dcbd60befff5947e0db2cc68e4e79db463670f581a4044ed4)
  on each Airtime release that carries this DOSBox-X: https://github.com/maitchison/airtime-releases/releases
