Merge tag 'pull-plugin-tweaks-051124-1' of https://gitlab.com/stsquad/qemu into staging

final plugin updates for 9.2

  - fix a warning in cflow plugin
  - replace Makefile with meson.build

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* tag 'pull-plugin-tweaks-051124-1' of https://gitlab.com/stsquad/qemu:
  contrib/plugins: remove Makefile for contrib/plugins
  meson: build contrib/plugins with meson
  contrib/plugins/cflow: fix warning

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