correct include so that builddir != srcdir works
correct include so that builddir != srcdir works

svn path=/trunk/ogg/; revision=3505

brion/ogg,brion/ogg,xiph/ogg,emscripten-ports/Ogg,youfearm3/ogg,mwgoldsmith/ogg,youfearm3/ogg,nicolaichuk/ogg,ShiftMediaProject/ogg,xiph/ogg,felipebetancur/ogg,eidy/libogg,emscripten-ports/Ogg,felipebetancur/ogg,ksophocleous/ogg,eidy/libogg,ShiftMediaProject/ogg,ksophocleous/ogg,nicolaichuk/ogg,mwgoldsmith/ogg