AVRO-2453: Implement interop test for the C bindings

[sekikn]

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Jira

• My PR addresses the following Avro Jira issues and references them in the PR title. For example, "AVRO-1234: My Avro PR"
  • https://issues.apache.org/jira/browse/AVRO-XXX
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Tests

• My PR adds the following unit tests OR does not need testing for this extremely good reason:

This PR is a fix for test_interop_data.c.

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Documentation

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