- Update to 2.12.0:
* Fix some manual page portability issues with groff 1.23.0.
* Fix test failures when a working `iconv` is not available.
* Ensure that timestamps read from the database can go past the year 2038,
even on systems where this is not the default.
* Fix `manpath` not parsing `PATH` entries with trailing slash correctly
for guessing `MANPATH` entries.
* More accurately document the behaviour of passing file names as arguments
to `man` without the `-l`/`--local-file` option.
* Avoid duplicate cleanup of old cat pages by both `man-db.service` and
`systemd-tmpfiles-clean.service`.
Improvements:
* Update system call lists in `seccomp` sandbox from `systemd`.
* Upgrade to Gnulib `stable-202307`.
* Work around the Firebuild accelerator in `seccomp` sandbox: if this is in
use then we need to allow some socket-related system calls.
* `man -K` now deduplicates search results that point to the same page.
* Warn if `mandb` drops to `--user-db` mode due to running as the wrong
user.
* Change section title recommendations in `man(1)` to mention `STANDARDS`
rather than `CONFORMING TO`, in line with `man-pages(7)`.
* Add a `STANDARDS` section to `man(1)` itself.
* Document that `man -K` may suffer from false negatives as well as false
positives.
* Take advantage of newer `groff` facilities to implement `man
--no-hyphenation` and `man --no-justification`, if available.
* `man -f` and `man -k` now pass any `-r`/`--regex` or `-w`/`--wildcard`
options on to `whatis` and `apropos` respectively.
* Always pass a line length to `nroff`, even if we believe that it matches
the default.