this seems to be unnecesary. las... check on osx please.

git-svn-id: svn+ssh://jackaudio.org/trunk/jack@3766 0c269be4-1314-0410-8aa9-9f06e86f4224

drivers/netjack/netjack_packet.c

@@ -28,9 +28,6 @@
 
 #include "config.h"
 
-#define _XOPEN_SOURCE 600
-#define _BSD_SOURCE
-
 #ifdef __APPLE__
 #define _DARWIN_C_SOURCE
 #endif