* Openglada: Correct libx11 version
* Index x11 on Arch
* Fix openglada 0.6 dependencies
* Set windowing system on Windows/macOS
* Fix gnat dependency to all platforms
Co-authored-by: Alejandro R. Mosteo <amosteo@unizar.es>
Also applied the rest of transformations described in alire#227: no top-level
[genera] table, name/version keys, [[depends-on]] array instead of table.