[Bug 260108] textproc/htmldoc: update to 1.9.13

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=260108

            Bug ID: 260108
           Summary: textproc/htmldoc: update to 1.9.13
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
               URL: https://www.msweet.org/blog/2021-11-05-htmldoc-1.9.13.
                    html
                OS: Any
            Status: New
          Keywords: easy
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs@FreeBSD.org
          Reporter: fuz@fuz.su
                CC: jose@diasfernandes.pt
                CC: jose@diasfernandes.pt
             Flags: maintainer-feedback?(jose@diasfernandes.pt)
 Attachment #229782 maintainer-approval+
             Flags:

Created attachment 229782
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=229782&action=edit
textproc/htmldoc: update to 1.9.13

Changes:

     - Now install a 32x32 icon for Linux
     - Fixed an issue with large values for roman numerals and letters in
headings
     - Fixed a crash bug when a HTML comment contains an invalid nul character
     - Fixed a crash bug with bogus BMP images
     - Fixed a potential heap overflow bug with bogus GIF images
     - Fixed a potential stack overflow bug with bogus BMP images

Tested with Poudriere on armv7 arm64 i386 amd64 FreeBSD 13.

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