[3.13] gh-131127: Minimal build support on systems using LibreSSL (GH-131128) (GH-132392)

(cherry picked from commit 1b49c8c)

Co-authored-by: Collin Funk <[email protected]>

Author: miss-islington

Misc/NEWS.d/next/Library/2025-03-11-21-08-46.gh-issue-131127.whcVdY.rst

@@ -0,0 +1 @@
+Systems using LibreSSL now successfully build.

Modules/_ssl.c

@@ -4744,7 +4744,7 @@ _ssl__SSLContext_sni_callback_set_impl(PySSLContext *self, PyObject *value)
     return 0;
 }
 
-#if OPENSSL_VERSION_NUMBER < 0x30300000L
+#if OPENSSL_VERSION_NUMBER < 0x30300000L && !defined(LIBRESSL_VERSION_NUMBER)
 static X509_OBJECT *x509_object_dup(const X509_OBJECT *obj)
 {
     int ok;