Dropping maintainership for multimedia/handbrake

[Jonathan]

I was hoping to fix the handbrake port and get it working properly over 
the summer but it didn't happen and now I'm in school full time.  I 
don't have time to work on the port anymore and I don't want people to 
not try and update it because someone else is already maintaining it.

If someone wants to take over this port let the list know and a ports 
committer will likely go ahead and assign it to you.

Jonathan