tools/mxsimage: Support building with LibreSSL

The mxsimage utility fails to compile against LibreSSL version < 2.7.0
because LibreSSL says it is OpenSSL 2.0, but it does not support the
complete OpenSSL 1.1 interface.

LibreSSL defines OPENSSL_VERSION_NUMBER with 0x20000000L and therefor
claims to have an API compatible with OpenSSL 2.0, but it implements
EVP_MD_CTX_new(), EVP_MD_CTX_free() and EVP_CIPHER_CTX_reset() only
starting with version 2.7.0, which is not yet released. OpenSSL
implements this function since version 1.1.0.

This commit will activate the compatibility code meant for
OpenSSL < 1.1.0 also for LibreSSL version < 2.7.0.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Reviewed-by: Jonathan Gray <jsg@jsg.id.au>

tools/mxsimage.c

@@ -26,7 +26,8 @@
  * OpenSSL 1.1.0 and newer compatibility functions:
  * https://wiki.openssl.org/index.php/1.1_API_Changes
  */
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#if OPENSSL_VERSION_NUMBER < 0x10100000L || \
+    (defined(LIBRESSL_VERSION_NUMBER) && LIBRESSL_VERSION_NUMBER < 0x2070000fL)
 static void *OPENSSL_zalloc(size_t num)
 {
 	void *ret = OPENSSL_malloc(num);