chore(main/glib): completely remove gobject-introspection dependency

[twaik]

Fixes #20070
Fixes #20447
This PR lets us build glib without downloading prebuilt gobject-introspection dependency

./build-package.sh glib

[TomJo2000]

Please also consult with @Maxython on this,
as this approach would conflict with the one contained as part of #20513.

Overall, I do like this approach.
But there's a couple head scratchers in here and I would very much encourage more comments.

[twaik]

So I consider it is fine, right?

[TomJo2000]

So I consider it is fine, right?

Almost, I missed your reply on the eval.
I'd still like to hash that out quick but other than that I think we're done with review.

[twaik]

Done.

[TomJo2000]

I know we've been making good progress on this PR,
and all my blockers are worked through.

But I'd like to wait for @Biswa96 and @Maxython to chime in before we merge this.

[Maxython]

In principle, I have no claims to the commit in this PR, which solves the selected issues. But you need to understand that this does not replace PR #20513, since other issues are solved there. Also (so that you know) in PR #20513, it is planned to implement virtual packages, which will allow solving cyclic problems using compilation if the package installation is impossible.

[Biswa96]

It looks good to me. I was asking for this since the cyclic dependency appeared. Alpine Linux does similar steps to resolve the issue https://gitlab.alpinelinux.org/alpine/aports/-/blob/master/main/glib/APKBUILD

Also 👍for the helpful comments in build script.