bug#44155: Print integers as characters

[Glenn Morris]

New test fails on some systems.
Ref: https://hydra.nixos.org/build/129474379
Reproduced on CentOS 8.2.

Test print-integer-output-format condition:
    (ert-test-failed
     ((should
       (equal
        (read ...)
        syms))
      :form
      (equal
       (-1 0 1 80 4194175 128 255 4194304)
       (-1 0 1 80 4194175 4194176 4194303 4194304))
      :value nil :explanation
      (list-elt 5
                (different-atoms
                 (128 "#x80" "?")
                 (4194176 "#x3fff80" "?\200")))))
   FAILED  19/39  print-integer-output-format (0.002202 sec)