c-ares / c-ares / #888

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Validate `ares_dns_rr_get_str()` can't return non-valid ASCII strings

The DNS message protocol when using non-binary strings needs to be in
the ASCII printable range.  The function prototype does elude to this
but it was not actually validating the string was in anyway valid and
could be used.  DNS parsing will now fail if an expected string isn't
an ASCII string.

Fixes Issue: #769
Fix By: Brad House (@bradh352)

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