- Update to 2.11.2:
* Fix compile and test failures when `troff` is not `groff`.
* Fix segfault in typical uses of `man` when `nroff` is not installed.
* Fix crash in `mandb` when processing stray cats.
* SECURITY: Replace `$` characters in page names with `?` when constructing
`less` prompts.
* Silence error message when processing an empty manual page hierarchy with
a nonexistent cache directory.
* `man(1)` now sorts whatis references below real pages, even if the whatis
references are from a section with higher priority.
* `mandb` now correctly records filters in the database if it uses cached
whatis information.
* Upgrade Gnulib, fixing syntax error on glibc systems with GCC 11.
* The `CATWIDTH` configuration file directive now overrides `MINCATWIDTH`
and `MAXCATWIDTH`.
* Database entries for links were often incorrectly stored as if they were
entries for the ultimate source of the page. They are now stored with
the correct type.
* Store links in the database using the section and extension of the link
rather than of the ultimate source file.
* Consider pages for adding to the database even if they seem to already
exist; this performance optimization is no longer needed due to caching,
and it produced inconsistent results in some unusual cases.
* `man` now runs any required preprocessors in the same order that `groff`
does, rather than trusting the order of filters in a page's preprocessor
string.
* Fix building on MinGW. (I haven't been able to test this; help from
MinGW experts would be welcome.)
Improvements:
* Check for stray cats even if no manual pages in a given manpath were