Merge tag 'pull-request-2022-05-09' of https://gitlab.com/thuth/qemu into staging

* Remove redundant/obsolete x86, arm and ppc disassemblers (Capstone is better)
* Limit some Xen-related code to builds where Xen is really available
* Remove hxtool-conv.pl and remove STEXI/ETEXI references from the docs
* Update MinGW and OpenBSD to a more recent version in the CI
* Warn user if the -vga flag is passed but no vga device is created

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# gpg: Good signature from "Thomas Huth <th.huth@gmx.de>" [undefined]
# gpg:                 aka "Thomas Huth <thuth@redhat.com>" [undefined]
# gpg:                 aka "Thomas Huth <th.huth@posteo.de>" [unknown]
# gpg:                 aka "Thomas Huth <huth@tuxfamily.org>" [undefined]
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* tag 'pull-request-2022-05-09' of https://gitlab.com/thuth/qemu:
  docs/devel/writing-monitor-commands: Replace obsolete STEXI/ETEXI tags
  Warn user if the vga flag is passed but no vga device is created
  tests/vm: update openbsd to release 7.1
  gitlab-ci: Upgrade mingw base package.
  cirrus/win32: upgrade mingw base packages
  doc: remove hxtool-conv.pl
  qemu-options: Limit the -xen options to x86 and arm
  softmmu/vl: Fence 'xenfb' if Xen support is not compiled in
  disas: Remove old libopcode ppc disassembler
  disas: Remove old libopcode i386 disassembler
  disas: Remove old libopcode arm disassembler

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