Add D++ library.

vendor/DPP/win32/include/openssl/ssl2.h

@@ -0,0 +1,24 @@
+/*
+ * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (the "License").  You may not use
+ * this file except in compliance with the License.  You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+#ifndef HEADER_SSL2_H
+# define HEADER_SSL2_H
+
+#ifdef  __cplusplus
+extern "C" {
+#endif
+
+# define SSL2_VERSION            0x0002
+
+# define SSL2_MT_CLIENT_HELLO            1
+
+#ifdef  __cplusplus
+}
+#endif
+#endif