Really virtual fix cpp qt enum asjsonobject #598

Job	Run time
Build Rust (samples/client/petstore/rust/)	53s
Build Rust (samples/server/petstore/rust-server/)	2m 8s
Build Rust (samples/client/others/rust/)	33s
Build Rust (samples/server/petstore/rust-axum/)	58s
	4m 32s

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