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65f9c1aca1
When checking that an answer is the answer to the question that
we asked, compare the name in a case-sensitive manner.
Clients can set the letters in a query to a random pattern of
uppercase and lowercase to add more randomness as protection against
cache-poisoning attacks, and we don't want to nullify that.
This actually restores the status quo before
commit ed6d29a784
since matching questions and answers using a checksum
can't help but be case sensitive.
This patch is a preparation for introducing DNS-0x20
in the dnsmasq query path.