* Buckets of known length should be always splitable. So we don't need to care

  about the APR_ENOTIMPL case.

Submitted by: jorton
Reviewed by: rpluem


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1164840 13f79535-47bb-0310-9956-ffa450edef68