Following up on r1717218, add include that apr.h thinks should be standard
on Windows, but not on other platforms.

* buckets/response_buckets.c
  (includes): Add stdlib.h


git-svn-id: https://svn.apache.org/repos/asf/serf/trunk@1717219 13f79535-47bb-0310-9956-ffa450edef68
1 file changed