Add "GET tls_library" to provide information on TLS library and version

This new wpa_supplicant and hostapd control interface command can be
used to determine which TLS library is used in the build and what is the
version of that library.

Signed-off-by: Jouni Malinen <j@w1.fi>

src/crypto/tls_internal.c

@@ -672,3 +672,9 @@ int tls_connection_set_session_ticket_cb(void *tls_ctx,
 #endif /* CONFIG_TLS_INTERNAL_SERVER */
 	return -1;
 }
+
+
+int tls_get_library_version(char *buf, size_t buf_len)
+{
+	return os_snprintf(buf, buf_len, "internal");
+}