When setting environment variables in the atrun script, use the
"export foo=bar" form instead of "foo=bar; export foo" since the
former allows the shell to catch variable names that are not valid
shell identifiers.  This will cause /bin/sh to exit with an error
(which gets mailed to the at user) and it will not run the script.

Obtained from:	OpenBSD (r1.63 millert)
MFC after:	3 days
Sigh, remove a line that needs to be removed along with previous commit.

Submitted by:	mjg
MFC after:	3 days
X-MFC-with:	272288