Rm _CRT_SECURE_NO_DEPRECATE for programs

(Already in config.h.)
diff --git a/programs/pkey/rsa_genkey.c b/programs/pkey/rsa_genkey.c
index 68e33e5..f92c50b 100644
--- a/programs/pkey/rsa_genkey.c
+++ b/programs/pkey/rsa_genkey.c
@@ -23,14 +23,10 @@
  *  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 <stdio.h>
 
-#include "polarssl/config.h"
-
 #include "polarssl/entropy.h"
 #include "polarssl/ctr_drbg.h"
 #include "polarssl/bignum.h"