https://git.ruby-lang.org/ruby.git/commit/?id=06a04a1aa3

From 06a04a1aa3fbf9132c61f4ced9582c36c96d3f65 Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Sat, 5 Oct 2019 19:08:23 +0900
Subject: ext/openssl/ossl_ssl.c: Use const declaration if LibreSSL >= 2.8.0

to suppress a warning in OpenBSD.

```
ossl_ssl.c:938:31: warning: incompatible pointer types passing 'SSL_SESSION *(SSL *, unsigned char *, int, int *)' (aka 'struct ssl_session_st *(struct ssl_st *, unsigned char *, int, int *)') to parameter of type 'SSL_SESSION *(*)(struct ssl_st *, const unsigned char *, int, int *)' (aka 'struct ssl_session_st *(*)(struct ssl_st *, const unsigned char *, int, int *)') [-Wincompatible-pointer-types]
        SSL_CTX_sess_set_get_cb(ctx, ossl_sslctx_session_get_cb);
                                     ^~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/openssl/ssl.h:738:20: note: passing argument to parameter 'get_session_cb' here
    SSL_SESSION *(*get_session_cb)(struct ssl_st *ssl,
                   ^
1 warning generated.
```

diff --git a/ext/openssl/ossl_ssl.c b/ext/openssl/ossl_ssl.c
index 64d7a84..473483f 100644
--- a/ext/openssl/ossl_ssl.c
+++ b/ext/openssl/ossl_ssl.c
@@ -380,7 +380,7 @@ ossl_call_session_get_cb(VALUE ary) https://github.com/ruby/ruby/blob/trunk/ext/openssl/ossl_ssl.c#L380
 }
 
 static SSL_SESSION *
-#if OPENSSL_VERSION_NUMBER >= 0x10100000 && !defined(LIBRESSL_VERSION_NUMBER)
+#if (!defined(LIBRESSL_VERSION_NUMBER) ? OPENSSL_VERSION_NUMBER >= 0x10100000 : LIBRESSL_VERSION_NUMBER >= 0x2080000f)
 ossl_sslctx_session_get_cb(SSL *ssl, const unsigned char *buf, int len, int *copy)
 #else
 ossl_sslctx_session_get_cb(SSL *ssl, unsigned char *buf, int len, int *copy)
-- 
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