Rm _CRT_SECURE_NO_DEPRECATE for programs

(Already in config.h.)
diff --git a/programs/x509/cert_app.c b/programs/x509/cert_app.c
index 30906b1..dedac94 100644
--- a/programs/x509/cert_app.c
+++ b/programs/x509/cert_app.c
@@ -23,16 +23,12 @@
  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#ifndef _CRT_SECURE_NO_DEPRECATE
-#define _CRT_SECURE_NO_DEPRECATE 1
-#endif
+#include "polarssl/config.h"
 
 #include <string.h>
 #include <stdlib.h>
 #include <stdio.h>
 
-#include "polarssl/config.h"
-
 #include "polarssl/entropy.h"
 #include "polarssl/ctr_drbg.h"
 #include "polarssl/net.h"