[Bug 264010] bc no longer has vi-keys history editing

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264010

            Bug ID: 264010
           Summary: bc no longer has vi-keys history editing
           Product: Base System
           Version: 13.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: obrien@FreeBSD.org

Up until FreeBSD 13.0, bc linked against either libreadline or libedit.  Both
of which support "vi keys" in addition to "emacs keys" for history editing.
~/.inputrc: "set editing-mode vi", ~/.editrc: "bind -v"

For those of use that have used their Shell with "vi keys" (tcsh/zsh: 'bindkey
-v', sh/ksh/bash: 'set -o vi') it is now much harder to use bc for anything
other than the simplest of things (such as: echo "1 + 2" | bc).

For those of us that have used Vi-keys for over 25 years, this bc is a MAJOR
regression and has made it very annoying to use.

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