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/rtpproto.c

@@ -113,7 +113,7 @@ static int rtp_open(URLContext *h, const char *uri, int flags)
 
     s = av_mallocz(sizeof(RTPContext));
     if (!s)
-        return -ENOMEM;
+        return AVERROR(ENOMEM);
     h->priv_data = s;
 
     url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port,