tools: avoid OpenSSL deprecation warnings

Our Gitlab CI buildsystem is set up to treat warnings as errors.
With OpenSSL 3.0 a lot of deprecation warnings occur.

With the patch compatibility with OpenSSL 1.1.1 is declared.
In the long run we should upgrade our code to use the current API.

A -Wdiscarded-qualifiers warning is muted by casting.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>

lib/aes/aes-encrypt.c

@@ -2,6 +2,9 @@
 /*
  * Copyright (c) 2019,Softathome
  */
+
+#define OPENSSL_API_COMPAT 0x10101000L
+
 #include "mkimage.h"
 #include <stdio.h>
 #include <string.h>

lib/ecdsa/ecdsa-libcrypto.c

@@ -18,6 +18,8 @@
  * Copyright (c) 2020,2021, Alexandru Gagniuc <mr.nuke.me@gmail.com>
  */
 
+#define OPENSSL_API_COMPAT 0x10101000L
+
 #include <u-boot/ecdsa.h>
 #include <u-boot/fdt-libcrypto.h>
 #include <openssl/ssl.h>

lib/rsa/rsa-sign.c

@@ -3,6 +3,8 @@
  * Copyright (c) 2013, Google Inc.
  */
 
+#define OPENSSL_API_COMPAT 0x10101000L
+
 #include "mkimage.h"
 #include <stdlib.h>
 #include <stdio.h>

tools/kwbimage.c

@@ -8,6 +8,8 @@
  * <thomas.petazzoni@free-electrons.com>
  */
 
+#define OPENSSL_API_COMPAT 0x10101000L
+
 #include "imagetool.h"
 #include <limits.h>
 #include <image.h>