softethervpn5: fix compilation without engines

Signed-off-by: Rosen Penev <rosenp@gmail.com>

net/softethervpn5/patches/010-engines.patch

@@ -0,0 +1,30 @@
+From ee3bf7f5079bcad51cc89197b6a9e34da746fc7e Mon Sep 17 00:00:00 2001
+From: Rosen Penev <rosenp@gmail.com>
+Date: Sat, 7 Aug 2021 20:05:04 -0700
+Subject: [PATCH] fix compilation without OpenSSL engines
+
+Signed-off-by: Rosen Penev <rosenp@gmail.com>
+---
+ src/Mayaqua/Encrypt.c | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+--- a/src/Mayaqua/Encrypt.c
++++ b/src/Mayaqua/Encrypt.c
+@@ -3128,6 +3128,7 @@ bool IsEncryptedK(BUF *b, bool private_k
+ 
+ K *OpensslEngineToK(char *key_file_name, char *engine_name)
+ {
++#ifndef OPENSSL_NO_ENGINE
+     K *k;
+ #if OPENSSL_API_COMPAT < 0x10100000L
+     ENGINE_load_dynamic();
+@@ -3140,6 +3141,9 @@ K *OpensslEngineToK(char *key_file_name,
+     k->pkey = pkey;
+     k->private_key = true;
+     return k;
++#else
++    return NULL;
++#endif
+ }
+ 
+ // Convert the BUF to a K