If charset quality of current variant and best variant is equal

and the best variant is in ISO-8859-1, then prefer current variant.

Submitted by: Petr Lampa
Reviewed by: Roy Fielding and Dean Gaudet


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@77754 13f79535-47bb-0310-9956-ffa450edef68