Fix make clean for test targets.

* Makefile.in
  (clean): Add missing objects from the test tree.

Submitted by: Brandon Ehle
Tweaked by: Justin Erenkrantz


git-svn-id: https://svn.apache.org/repos/asf/serf/trunk@1698621 13f79535-47bb-0310-9956-ffa450edef68
1 file changed