Include patch from FreeBSD ports tree.

gtests/net/packetdrill/platforms.h

@@ -50,11 +50,12 @@
 
 #include <netinet/sctp.h>
 #include <sys/param.h>
+#include <paths.h>
 #if __FreeBSD_version >= 1001000
 #include <netinet/udplite.h>
 #endif
 #define USE_LIBPCAP             1
-#define TUN_DIR                 "/dev"
+#define TUN_DIR                 _PATH_DEV
 #define HAVE_TCP_INFO           1
 #if (__FreeBSD_version < 1000000 && __FreeBSD_version > 902000) || __FreeBSD_version > 1000028
 #define HAVE_FMEMOPEN           1