Proper use of these packages would require calling `pkg-config` to set up
environment, which Alire does not do (yet?)
Co-authored-by: GHA <actions@github.com>
* Add macOS support to GTKAda 21.0.0.
* Fix sed syntax for Linux.
* To be compatible between macOS and Linux, we should avoid sed -i and use tmp files instead.
* Disable problematic platforms
Co-authored-by: GHA <actions@github.com>