[mythtv] Updated patch for directshow filters with MythTV (for CoreAVC)

[Alan Nisota]

I've been getting a lot of requests to update my directshow patches to 
support CoreAVC 1.2, so I have finally done so.
I have filed ticket #3053:
http://svn.mythtv.org/trac/ticket/3053
with all the relevant info.
Note that many things have changed, so be sure to read the directions in 
the ticket carefully.
Installing 1.2 does not seem to be possible via Wine at this time, so 
you will likely need a real Windows installation w/ internet connection 
to get the codec installed.  The code should still work with all prior 
releases of the codec.

I realize that this is adding support for a non-free codec, but for 
some, it is the only way to watch HD DVB programming