functional and tcg tests, plugins and MAINTAINERS

  - update and expand aarch64 GPU tests
  - fix build dependence for plugins
  - update libvirt-ci to vulkan-tools
  - allow plugin tests to run on non-POSIX systems
  - tweak test/vm times
  - mark test-vma as linux only
  - various compiler fixes for tcg tests
  - add gitlab build unit tracker
  - error out early on stalled RME tests
  - compile core plugin code once
  - update MAINTAINERS