Add PHP Extension for GmSSL

View http://gmssl.org/docs/php-api.html for more info.

php/ext/openssl/tests/bug74099.phpt

@@ -0,0 +1,20 @@
+--TEST--
+Bug #74099 Memory leak with openssl_encrypt()
+--SKIPIF--
+<?php
+if (!extension_loaded("openssl")) die("skip");
+?>
+--FILE--
+<?php
+$aad = random_bytes(32);
+$iv = random_bytes(16);
+$key = random_bytes(32);
+
+$plaintext = '';
+$tag = null;
+
+$ciphertext = openssl_encrypt($plaintext, 'aes-256-gcm', $key, \OPENSSL_RAW_DATA, $iv, $tag, $aad);
+var_dump($ciphertext);
+?>
+--EXPECTF--
+string(0) ""