Subject: Fix build with OpenSSL 3
Author: James McCoy <jamessan@debian.org>
Origin: https://salsa.debian.org/jamessan/serf/-/blob/500faae58ca4a8f84c2c4a485c81ed4867be57a6/debian/patches/openssl-3.x
Bug-Debian: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1006572

Remove use of ERR_GET_FUNC when it's not defined, as is the case with OpenSSL >= 3.

See https://www.openssl.org/news/cl30.txt

 * The ERR_GET_FUNC() function was removed.  With the loss of meaningful
   function codes, this function can only cause problems for calling
   applications.

--- buckets/ssl_buckets.c
+++ buckets/ssl_buckets.c
@@ -1325,9 +1325,14 @@ static int ssl_need_client_cert(SSL *ssl, X509 **cert, EVP_PKEY **pkey)
                 return 0;
             }
             else {
+#ifdef ERR_GET_FUNC
                 printf("OpenSSL cert error: %d %d %d\n", ERR_GET_LIB(err),
                        ERR_GET_FUNC(err),
                        ERR_GET_REASON(err));
+#else
+                printf("OpenSSL cert error: %d %d\n", ERR_GET_LIB(err),
+                       ERR_GET_REASON(err));
+#endif
                 PKCS12_free(p12);
                 bio_meth_free(biom);
             }