update to bozohttpd 20201014.  changes include:

        o  also set -D_GNU_SOURCE in Makefile.boot.  from
          hadrien.lacour@posteo.net.
        o  fix array size botch (assertion, not exploitable.)  from
          martin@netbsd.org.
        o  also match %2F as well as %2f.  from leah@vuxu.org.
        o  many manual and help fixes.  clean ups for higher lint levels,
          consistency/style clean ups.  various option fixes including made
          -f imply -b.  from <henrik@gulbra.net> for freebsd.
        o  add .m4a and .m4v file extensions.
        o  make this work on sun2 by reducing mmap window there.
        o  fix SSL shutdown sequence.  from spz@netbsd.org.
        o  add readme support to directory indexing.  from jmcneill@netbsd.org
        o  add blocklist(8) support.  from jruoho@netbsd.org.

(mrg)