c-ares / c-ares / #1225

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Propagate record duplication error code (#820)

In c-ares 1.30.0 we started validating strings parsed are printable.
This caused a regression in a pycares test case due to a wrong response
code being returned as the error was being propagated from a different
section of code that was assuming the only possible failure condition
was out-of-memory.

This PR adds a fix for this and also a test case to validate it.

Ref: https://github.com/saghul/pycares/issues/200
Fix By: Brad House (@bradh352)

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