Add a new environment variable to keep the charset from being
	included on canned error documents.  (Having it there make
	some browsers apply it to the redirect target document.)

Reviewed by:	Bill Stoddard, Jim Jagielski, Justin Erenkrantz, Cliff Woolley


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@96362 13f79535-47bb-0310-9956-ffa450edef68