spelling fix as suggested by Mans

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@8596 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

Changelog

@@ -76,7 +76,7 @@ version <next>
 - DXA demuxer and decoder
 - DNxHD decoder
 - Gamecube movie (.THP) playback system
-- bfin optimizations
+- Blackfin optimizations
 
 version 0.4.9-pre1: