OSX and BeOS networking fix (socklen_t)

Originally committed as revision 2077 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/barpainet.h

@@ -16,6 +16,8 @@ struct ip_mreq {
     struct in_addr imr_interface;  /* local IP address of interface */
 };
 
+#include <netdb.h>
+
 #else
 # include <arpa/inet.h>
 #endif

libavformat/rtsp.c

@@ -18,6 +18,7 @@
  */
 #include "avformat.h"
 
+#include <unistd.h> /* for select() prototype */
 #include <sys/time.h>
 #include <netinet/in.h>
 #include <sys/socket.h>

libavformat/tcp.c

@@ -22,6 +22,9 @@
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
+#if defined(__APPLE__) || defined(__BEOS__)
+typedef int socklen_t;
+#endif
 #ifndef __BEOS__
 # include <arpa/inet.h>
 #else