Merge pull request #2006 from ARMmbed/merge_nanostack_v10.1.1_changes_back_to_master

Merge nanostack v10.1.1 changes back to master

Author: Arto Kinnunen

source/Security/protocols/tls_sec_prot/tls_sec_prot_lib.c

@@ -24,7 +24,7 @@
 #include MBEDTLS_CONFIG_FILE
 #endif
 
-#if defined(MBEDTLS_SSL_TLS_C)
+#if defined(MBEDTLS_SSL_TLS_C) && defined(MBEDTLS_X509_CRT_PARSE_C)
 #define WS_MBEDTLS_SECURITY_ENABLED
 #endif