dns/dnsdbq: Upgrade to version 2.6.4

• 2.6.1
  • use 'zu' format string in deduper_dump() (#196)
  • ctype.h functions require int arguments. cygwin gcc enforces this. Update version to 2.6.1
• 2.6.2
  • fix three memory leaks revealed by valgrind (#202)
  • see if we can remove the need for res_rcode() by changing the error path (#200)
  • use strtok_r() in preference to strsep(), for consistency and modernity (#203)
  • based on PR 204, refactor and comment for clarity (#205)

• 2.6.3
  • • replace strtok_r() by new tokstr library
    • tokstr_h was a typo, thanks to codereview.stackexchange.com for finding it
    • attempt to work around gcc11 structure size checks (#207)
    • tokstr regions (#208)
    • Revised fix for issue 209: "error: unknown type ssize_t; did you mean _ssize_t?" (#211)
    • Can now build on Apple M1 processors by following the instructions (#212)
    • Clarify that not all macOS M1 machines have homebrew in the new /opt/homebrew location
    • Document again the HTTPS_PROXY environment variable
  • 2.6.4
    • Issue 214: batch option parsing bug in tokstr library changes. (#215)

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