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ARROW-18409: [GLib][Plasma] Suppress deprecated warning in building plasma-glib (#14739)

If we always get "Plasma is deprecated since Arrow 10.0.0. ..." warning from plasma/common.h, we can't use -Dwerror=true Meson option with plama-glib.

Authored-by: Sutou Kouhei <kou@clear-code.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>