* build.conf
  (checksum-test): Add zlib as dependency in an attempt to make the
    svn-x64-ubuntu-gcc bot happy en though libsvn_subr already links it.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1537263 13f79535-47bb-0310-9956-ffa450edef68