This fixes error handling for BeOS, removing the need for some ifdefs.

AVERROR_ defines are moved to avcodec.h as they are needed in there as well. Feel free to move that to avutil/common.h.
Bumped up avcodec/format version numbers as though it's binary compatible we will want to rebuild apps as error values changed.
Please from now on use return AVERROR(EFOO) instead of the ugly return -EFOO in your code.
This also removes the need for berrno.h.

Originally committed as revision 7965 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/mpeg.c

@@ -513,7 +513,7 @@ static int mpeg_mux_init(AVFormatContext *ctx)
     for(i=0;i<ctx->nb_streams;i++) {
         av_free(ctx->streams[i]->priv_data);
     }
-    return -ENOMEM;
+    return AVERROR(ENOMEM);
 }
 
 static inline void put_timestamp(ByteIOContext *pb, int id, int64_t timestamp)