demote the Content-Range/416/SSI problem to non-showstopper.

It's been happening for ages, there are no PRs I'm aware of, and the core
dumps that happened as a side effect in 2.0.35 seem to be resolved.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@94797 13f79535-47bb-0310-9956-ffa450edef68