Add stdlib include (free, atoi, exit).

Original commit message from CVS:
* examples/app/appsrc_ex.c:
* examples/switch/switcher.c:
* ext/neon/gstneonhttpsrc.c:
* ext/timidity/gstwildmidi.c:
* ext/x264/gstx264enc.c:
* gst/mve/mveaudioenc.c: (mve_compress_audio):
* gst/rtpmanager/gstrtpclient.c:
* gst/rtpmanager/gstrtpjitterbuffer.c:
* gst/spectrum/demo-audiotest.c:
* gst/spectrum/demo-osssrc.c:
* sys/dvb/gstdvbsrc.c:
Add stdlib include (free, atoi, exit).

tests/examples/spectrum/demo-audiotest.c

@@ -21,6 +21,7 @@
 #include "config.h"
 #endif
 
+#include <stdlib.h>
 #include <string.h>
 #include <math.h>
 #include <gst/gst.h>

tests/examples/spectrum/demo-osssrc.c

@@ -20,6 +20,8 @@
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
+
+#include <stdlib.h>
 #include <string.h>
 #include <math.h>
 #include <gst/gst.h>