Add more eclasses to package automation

[krnowak]

Adds the rest of eclasses under automation (except for usr-ldscript.eclass, that we overrode to be an empty eclass).

CI: http://jenkins.infra.kinvolk.io:8080/job/container/job/sdk/1617/cldsv/

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• eclass/check-reqs.eclass:

  • doc fixes, mostly

• eclass/crossdev.eclass:

  • nothing changed

• eclass/db-use.eclass:

  • dropped support for EAPI 5 and 6
  • use ESYSROOT rather than EPREFIX where appropriate

• eclass/gnome2-utils.eclass:

  • dropped support for EAPI 5 and 6

• eclass/go-env.eclass:

  • fixed setting dev environment for other arches

• eclass/golang-base.eclass:

  • dropped support for EAPI 5 and 6

• eclass/golang-vcs.eclass:

  • dropped support for EAPI 6
  • there were some flatcar modifications, but there were merged upstream

• eclass/golang-vcs-snapshot.eclass:

  • dropped support for EAPI 6
  • there were some flatcar modifications, but there were merged upstream

• eclass/go-module.eclass:

  • bumped minimal go version to 1.20
  • there were some flatcar modifications, but there were merged upstream

• eclass/linux-mod-r1.eclass:

  • added some module compression, initramfs rebuild and reinstallation, and dist kernel handling goo

• eclass/llvm-r1.eclass:

  • bumped llvm stable version to 18

• eclass/llvm-utils.eclass:

  • nothing changed

• eclass/mercurial.eclass:

  • became unmaintained
  • removed some vestiges of EAPI 0, 1 and 2

• eclass/mono-env.eclass:

  • dropped support for EAPI 5

• eclass/out-of-source.eclass:

  • nothing changed

• eclass/perl-module.eclass:

  • update to the new perl features stuff (that replaced some USE flags)

• eclass/qmake-utils.eclass:

  • added support for qt6

• eclass/secureboot.eclass:

  • added build dependency on dev-libs/openssl on ebuilds inheriting this eclass
  • added sanity checks for keys and certs to be in proper formats

• eclass/sgml-catalog-r1.eclass:

  • strip ROOT when generating catalog

• eclass/ssl-cert.eclass:

  • dropped support for EAPI 6

• eclass/subversion.eclass:

  • dropped support for EAPI 6
  • use BDEPEND instead of DEPEND
  • mostly doc updates and bash refreshing

• eclass/vcs-snapshot.eclass:

  • dropped support for EAPI 6

• eclass/xdg.eclass:

  • dropped support for EAPI 5

--

• Inspected CI output for image differences: /boot and /usr size, packages, list files for any missing binaries, kernel modules, config files, kernel modules, etc.

[krnowak]

CI passed.

[github-actions]

Build action triggered: https://github.com/flatcar/scripts/actions/runs/10262849750

[tormath1]

Thanks!