Squashed 'features/nanostack/sal-stack-nanostack/' changes from 76da6a5..84a07ce

84a07ce Merge branch 'release_internal' into release_external
80b1e23 Check X509 config before using the functions

git-subtree-dir: features/nanostack/sal-stack-nanostack
git-subtree-split: 84a07ce

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