Fix build with gcc 4.3

[taken from Debian patches]

akode/akodeplay/akodeplay.cpp

@@ -25,6 +25,8 @@
 #include "../lib/sink.h"
 #include "../lib/decoder.h"
 
+#include <cstdlib>
+
 #ifdef HAVE_GNU_GETOPT
   #include <getopt.h>
 #else

akode/lib/auto_sink.cpp

@@ -21,6 +21,7 @@
 #include "audioframe.h"
 #include "auto_sink.h"
 
+#include <cstdlib>
 #include <iostream>
 
 namespace aKode {