Enable benchmark's native target

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https://github.com/Kotlin/kotlinx-io/issues/195 disabled native target for benchmarks. It should be enabled back as soon as:

• kotlinx-benchmark will support Kotlin 1.9
• https://github.com/Kotlin/kotlinx-benchmark/issues/114 will be fixed.

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kotlinx-benchmark will support Kotlin 1.9

Added in version 0.4.9