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Allow fallback to IDNA2003 processing

Ondřej Surý requested to merge 3485-dig-fallback-to-idna2003-v9_16 into v9_16

In several cases where IDNA2008 mappings do not exist whereas IDNA2003 mappings do, dig was failing to process the suplied domain name. Take a backwards compatible approach, and convert the domain to IDNA2008 form, and if that fails try the IDNA2003 conversion.

(cherry picked from commit 10923f9d)

Closes #3485 (closed)

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