File _service of Package pcre

<services>
  <service name="download_url">
    <param name="protocol">ftp</param>
    <param name="host">ftp.csx.cam.ac.uk</param>
    <param name="path">/pub/software/programming/pcre/pcre-8.12.tar.bz2</param>
  </service>
  <service name="verify_file">
    <param name="file">_service:download_url:pcre-8.12.tar.bz2</param>
    <param name="verifier">sha256</param>
    <param name="checksum">c63070d461edc451ec9457f2324e152a531e907d5c5d2d8f8121e725acd1aeec</param>
  </service>
</services>