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/http.c

@@ -120,7 +120,7 @@ static int http_open(URLContext *h, const char *uri, int flags)
 
     s = av_malloc(sizeof(HTTPContext));
     if (!s) {
-        return -ENOMEM;
+        return AVERROR(ENOMEM);
     }
     h->priv_data = s;
     s->filesize = -1;