rsyslog upgrade
    
    - upgrade to new upstream version 5.8.7
    - change license from 'GPLv3+' to '(GPLv3+ and ASL 2.0)'
      http://blog.gerhards.net/2012/01/rsyslog-licensing-update.html
    - use a specific version for obsoleting sysklogd
    - add patches for better sysklogd compatibility (taken from upstream)