We must always use case-insensitive comparisons in mod_mime even if

our platform is not "case-blind."  This matches 1.3 behavior and our
docs say that the extension argument is case-insensitive anyway.

This is case where the code fix is easier than the doc fix.  =)

PR: 8223


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@94789 13f79535-47bb-0310-9956-ffa450edef68