contrib/realtime: Remove empty SQL script files

Since the relatime scripts are now managed by Alembic, the previous realtime
scripts were previously removed. However, the removal process messed up, as
the files were still in the repository. The contents were just empty.

This removes the files from the tree.
........

Merged revisions 411442 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@411443 f38db490-d61c-443f-a65b-d21fe96a405b