[Midnightbsd-cvs] src: env.c: Add the '-u name' option to the env command, which will

[laffer1 at midnightbsd.org]

Log Message:
-----------
Add the '-u name' option to the env command, which will completely
unset the given variable name (removing it from the environment, instead
of just setting it to a null value).

Obtained from: FreeBSD

Modified Files:
--------------
    src/usr.bin/env:
        env.c (r1.3 -> r1.4)
        (http://cvsweb.midnightbsd.org/src/usr.bin/env/env.c?r1=1.3&r2=1.4)