Merge remote-tracking branch 'remotes/thuth-gitlab/tags/pull-request-2021-08-11'...

* Fixes for the gitlab-CI (fix the hanging  build-oss-fuzz pipeline)
* Add documentation about features that have been removed in older versions

# gpg: Signature made Wed 11 Aug 2021 14:46:12 BST
# gpg:                using RSA key 27B88847EEE0250118F3EAB92ED9D774FE702DB5
# gpg:                issuer "thuth@redhat.com"
# gpg: Good signature from "Thomas Huth <th.huth@gmx.de>" [full]
# gpg:                 aka "Thomas Huth <thuth@redhat.com>" [full]
# gpg:                 aka "Thomas Huth <huth@tuxfamily.org>" [full]
# gpg:                 aka "Thomas Huth <th.huth@posteo.de>" [unknown]
# Primary key fingerprint: 27B8 8847 EEE0 2501 18F3  EAB9 2ED9 D774 FE70 2DB5

* remotes/thuth-gitlab/tags/pull-request-2021-08-11:
  docs/about/removed-features: Document removed machines from older QEMU versions
  docs/about/removed-features: Document removed devices from older QEMU versions
  docs/about/removed-features: Document removed HMP commands from QEMU v2.12
  docs/about/removed-features: Document removed CLI options from QEMU v3.1
  docs/about/removed-features: Document removed CLI options from QEMU v3.0
  docs/about/removed-features: Document removed CLI options from QEMU v2.12
  fuzz: avoid building twice, when running on gitlab
  tests/qtest/vhost-user-blk-test: Check whether qemu-storage-daemon is available
  storage-daemon: Add missing build dependency to the vhost-user-blk-test
  gitlab: skip many more targets in windows cross builds
  gitlab: exclude sparc-softmmu and riscv32-softmmu from cross builds

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>