When determining the path of the script inside mhmail, handle case
authorDavid Levine <levinedl@acm.org>
Sun, 23 Sep 2012 14:00:11 +0000 (09:00 -0500)
committerDavid Levine <levinedl@acm.org>
Sun, 23 Sep 2012 14:00:11 +0000 (09:00 -0500)
where $0 is just the script name, without any directory.  Bourne
shell does that if the script is found using PATH.


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