Add ff_ prefix to data symbols of encoders, decoders, hwaccel, parsers, bsf.

None of these symbols should be accessed directly, so declare them as
hidden.

Signed-off-by: Mans Rullgard <[email protected]>
diff --git a/libavcodec/8bps.c b/libavcodec/8bps.c
index 292c739..4757057 100644
--- a/libavcodec/8bps.c
+++ b/libavcodec/8bps.c
@@ -219,7 +219,7 @@
 
 
 
-AVCodec eightbps_decoder = {
+AVCodec ff_eightbps_decoder = {
         "8bps",
         AVMEDIA_TYPE_VIDEO,
         CODEC_ID_8BPS,