Removed uses of stdlib.h and string.h

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%401342

src/joystick/darwin/SDL_sysjoystick.c

@@ -23,11 +23,8 @@
 /* SDL joystick driver for Darwin / MacOS X, based on the IOKit HID API */
 /* Written 2001 by Max Horn */
 
-#include <stdio.h>
-#include <stdlib.h>
 #include <unistd.h>
 #include <ctype.h>
-#include <sys/errno.h>
 #include <sysexits.h>
 #include <mach/mach.h>
 #include <mach/mach_error.h>