[Midnightbsd-cvs] src: src/games: add arithmetic game from DragonFly.

[laffer1 at midnightbsd.org]

Log Message:
-----------
add arithmetic game from DragonFly.

Modified Files:
--------------
    src/games:
        Makefile (r1.2 -> r1.3)

Added Files:
-----------
    src/games/arithmetic:
        Makefile (r1.1)
        arithmetic.6 (r1.1)
        arithmetic.c (r1.1)