* 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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