Get rid of LESS_SLACK_JACK in favor of existing NO_SLACK and make

minor change to NO_SLACK to optimize out the ap_slack() function
entirely when NO_SLACK is defined.

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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@78498 13f79535-47bb-0310-9956-ffa450edef68