Add CHANGES and COPYING to the distribution target.
Add CHANGES and COPYING to the distribution target.

svn path=/trunk/vorbis/; revision=10745

ksophocleous/vorbis,emscripten-ports/Vorbis,nicolaichuk/vorbis,youfearm3/vorbis,eidy/vorbis,ShiftMediaProject/vorbis,ksophocleous/vorbis,erikd/vorbis,mwgoldsmith/vorbis,emscripten-ports/Vorbis,eidy/vorbis,emscripten-ports/Vorbis,youfearm3/vorbis,felipebetancur/vorbis,ShiftMediaProject/vorbis,ShiftMediaProject/vorbis,erikd/vorbis,ShiftMediaProject/vorbis,ShiftMediaProject/vorbis,mwgoldsmith/vorbis,eidy/vorbis,youfearm3/vorbis,felipebetancur/vorbis,erikd/vorbis,nicolaichuk/vorbis,emscripten-ports/Vorbis,youfearm3/vorbis,mwgoldsmith/vorbis,nicolaichuk/vorbis,mwgoldsmith/vorbis,eidy/vorbis,felipebetancur/vorbis,felipebetancur/vorbis,ShiftMediaProject/vorbis,ksophocleous/vorbis,erikd/vorbis,ksophocleous/vorbis,nicolaichuk/vorbis