Add missing stdlib.h #include, fixes the warnings:

tools/trasher.c:44: warning: implicit declaration of function ‘atoi’
tools/trasher.c:53: warning: implicit declaration of function ‘abs’


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@22328 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

tools/trasher.c

@@ -19,6 +19,7 @@
  */
 
 #include <stdio.h>
+#include <stdlib.h>
 #include <inttypes.h>
 
 static uint32_t state;