Revert misguided commit r1799731.

Revert misguided commit r1799731.

Discussion on-list, but any occurance of a platform-specific behavior in this
code path will alter the behavior of the core code and introduce the very
fingerprintable behavior this patch pretended to obscuficate.

Returning 404 for /CON for example may lead to a module such as mod_speling
revealing the existance of a real file named similar to /.conf, which makes
this an unwise behavior.

Further discussion of returning 404 for all CHR files encountered in the
filepath (not URI path), which currently return 403 on all platforms,
belongs on the dev list.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1799965 13f79535-47bb-0310-9956-ffa450edef68