backport from trunk:

   Correct mod_cgid's argv[0] so that the full path can be delved by the
   invoked cgi application, to conform to the behavior of mod_cgi.
   [Pradeep Kumar S <pradeep.smani gmail.com>]

Reviewed by: wrowe, colm, trawick


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.0.x@280123 13f79535-47bb-0310-9956-ffa450edef68