[Midnightbsd-cvs] src: Makefile: update version string

[laffer1 at midnightbsd.org]

Log Message:
-----------
update version string

Modified Files:
--------------
    src/usr.bin/tar:
        Makefile (r1.7 -> r1.8)
        (http://cvsweb.midnightbsd.org/src/usr.bin/tar/Makefile?r1=1.7&r2=1.8)