basic auth token should be tested case-insensitive

PR:		1666
Submitted by:	Ronald.Tschalaer@psi.ch
Reviewed by:	Dean Gaudet, Martin Kraemer, Ken Coar


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@79907 13f79535-47bb-0310-9956-ffa450edef68