Remove apparently unneeded define and includes.

Originally committed as revision 22229 to svn://svn.ffmpeg.org/ffmpeg/trunk

tools/trasher.c

@@ -18,10 +18,7 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
-#define _XOPEN_SOURCE 600
 #include <stdio.h>
-#include <stdlib.h>
-#include <time.h>
 #include <inttypes.h>
 
 static uint32_t state;