Fix all remaining warnings in gp2x build. The compiler is a bit more picky about the includes and feature macros.

git-svn-id: svn://pulkomandy.tk/GrafX2/trunk@1352 416bcca6-2ee7-4201-b75f-2eb2f807beb1

miscfileformats.c

@@ -25,6 +25,9 @@
 ///@file miscfileformats.c
 /// Formats that aren't fully saving, either because of palette restrictions or other things
 
+#include <stdlib.h>
+#include <string.h>
+
 #include "engine.h"
 #include "errors.h"
 #include "global.h"