Moved include of <sys/cdefs.h> earlier for the same reasons as moving

it in <sys/types.h>.

PR:	5785

include/stdlib.h

@@ -36,6 +36,8 @@
 #ifndef _STDLIB_H_
 #define	_STDLIB_H_
 
+#include <sys/cdefs.h>
+
 #include <machine/ansi.h>
 
 #if !defined(_ANSI_SOURCE) && !defined(_POSIX_SOURCE)
@@ -79,8 +81,6 @@ typedef struct {
 extern int __mb_cur_max;
 #define	MB_CUR_MAX	__mb_cur_max
 
-#include <sys/cdefs.h>
-
 __BEGIN_DECLS
 void	 abort __P((void)) __dead2;
 int	 abs __P((int)) __pure2;