Merge tag 'pull-request-2024-08-16' of https://gitlab.com/thuth/qemu into staging

* Fix a potential build warning in the s390x target code
* Check for the availability of __attribute__((gcc_struct)) on MSYS2
* Fix skipUnless decorators in Avocado tests
* Add missing gtk-vnc package to the CI jobs

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# gpg: Good signature from "Thomas Huth <th.huth@gmx.de>" [full]
# gpg:                 aka "Thomas Huth <thuth@redhat.com>" [full]
# gpg:                 aka "Thomas Huth <th.huth@posteo.de>" [unknown]
# gpg:                 aka "Thomas Huth <huth@tuxfamily.org>" [full]

* tag 'pull-request-2024-08-16' of https://gitlab.com/thuth/qemu:
  ci: refresh package lists with lcitool
  ci: add gtk-vnc to the deps
  tests/avocado: apply proper skipUnless decorator
  meson.build: Check for the availability of __attribute__((gcc_struct)) on MSYS2
  target/s390x: fix build warning (gcc-12 -fsanitize=thread)

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>