Merge tag 'pull-request-2021-11-17' of https://gitlab.com/thuth/qemu into staging

* Remove some unused #defines in s390x code
* rSTify some of the development process pages from the Wiki
* Revert a useless patch in the device-crash-test script
* Bump timeout of the Cirrus-CI jobs to 80 minutes

# gpg: Signature made Wed 17 Nov 2021 11:13:43 AM CET
# 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 <th.huth@posteo.de>" [unknown]
# gpg:                 aka "Thomas Huth <huth@tuxfamily.org>" [full]

* tag 'pull-request-2021-11-17' of https://gitlab.com/thuth/qemu:
  gitlab-ci/cirrus: Increase timeout to 80 minutes
  Revert "device-crash-test: Ignore errors about a bus not being available"
  docs: rSTify the "SubmitAPatch" wiki
  docs: rSTify the "SubmitAPullRequest" wiki
  docs: rSTify the "TrivialPatches" wiki
  target/s390x/cpu.h: Remove unused SIGP_MODE defines

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