This patch updates contrib/ to java-gcj-compat 1.0.80, improving diagnostics,
and adds the generate-cacerts.pl script (which everybody includes for packaging
anyway). Changes to generate-cacerts.pl compared to java-gcj-compat are:

  - Allow passing a file name as parameter
  - Use the name of the installed keytool
  - Change the copyright header to the one found in the other contrib files.
    This has to be approved by the former copyright holder.

Attached is the patch, and the diff for generate-cacerts.pl. Ok for the trunk
(and then for the branch)?

  Matthias