Fix build on 6.x after changing swab() prototypes in <unistd.h> and

<string.h>

sysutils/gtoaster/files/patch-stdfiletrack.c

@@ -0,0 +1,18 @@
+
+$FreeBSD$
+
+--- stdfiletrack.c.orig
++++ stdfiletrack.c
+@@ -21,7 +21,12 @@
+ #include "dependencies.h"
+ 
+ #ifndef __svr4__
++#include <osreldate.h>
++#if __FreeBSD_version >= 600007
++void swab(const void *from,void *to,ssize_t n);
++#else
+ void swab(const void *from,void *to,size_t n);
++#endif
+ #endif
+ 
+ #include "tracks.h"