meson: build contrib/plugins with meson

Tried to unify this meson.build with tests/tcg/plugins/meson.build but
the resulting modules are not output in the right directory.

Originally proposed by An

meson: build contrib/plugins with meson

Tried to unify this meson.build with tests/tcg/plugins/meson.build but
the resulting modules are not output in the right directory.

Originally proposed by Anton Kochkov, thank you!

Solves: https://gitlab.com/qemu-project/qemu/-/issues/1710
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Message-Id: <20241023212812.1376972-3-pierrick.bouvier@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>

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