- 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

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