Comply with the received Record Size Limit extension

Fixes #7010

Signed-off-by: Jan Bruckner <jan@janbruckner.de>
diff --git a/include/mbedtls/ssl.h b/include/mbedtls/ssl.h
index 043988f..39baa42 100644
--- a/include/mbedtls/ssl.h
+++ b/include/mbedtls/ssl.h
@@ -1188,6 +1188,11 @@
     unsigned char MBEDTLS_PRIVATE(mfl_code);     /*!< MaxFragmentLength negotiated by peer */
 #endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
 
+/*!< Record Size Limit for outgoing data requested by peer */
+#if defined(MBEDTLS_SSL_RECORD_SIZE_LIMIT)
+    uint16_t MBEDTLS_PRIVATE(record_size_limit);
+#endif /* MBEDTLS_SSL_RECORD_SIZE_LIMIT */
+
     unsigned char MBEDTLS_PRIVATE(exported);
 
     /** TLS version negotiated in the session. Used if and when renegotiating