Fix "int vs enum" warnings from armcc v5

enumerated type mixed with another type
diff --git a/library/ssl_ciphersuites.c b/library/ssl_ciphersuites.c
index 43e5e7b..dffcd22 100644
--- a/library/ssl_ciphersuites.c
+++ b/library/ssl_ciphersuites.c
@@ -1674,7 +1674,9 @@
 #endif /* POLARSSL_DES_C */
 #endif /* POLARSSL_ENABLE_WEAK_CIPHERSUITES */
 
-    { 0, "", 0, 0, 0, 0, 0, 0, 0, 0 }
+    { 0, "",
+      POLARSSL_CIPHER_NONE, POLARSSL_MD_NONE, POLARSSL_KEY_EXCHANGE_NONE,
+      0, 0, 0, 0, 0 }
 };
 
 #if defined(SSL_CIPHERSUITES)