fix FTBFS with OpenSSL 3.0 beta 2 (#1991008)

Resolves: rhbz#1991008

libserf-1.3.9-errgetfunc.patch

@@ -0,0 +1,13 @@
+--- serf-1.3.9/buckets/ssl_buckets.c.errgetfunc
++++ serf-1.3.9/buckets/ssl_buckets.c
+@@ -1204,6 +1204,10 @@
+     }
+ }
+ 
++#ifndef ERR_GET_FUNC
++#define ERR_GET_FUNC(ec) (0)
++#endif
++
+ static int ssl_need_client_cert(SSL *ssl, X509 **cert, EVP_PKEY **pkey)
+ {
+     serf_ssl_context_t *ctx = SSL_get_app_data(ssl);

libserf.spec

@@ -1,6 +1,6 @@
 Name:           libserf
 Version:        1.3.9
-Release:        23%{?dist}
+Release:        24%{?dist}
 Summary:        High-Performance Asynchronous HTTP Client Library
 License:        ASL 2.0
 URL:            http://serf.apache.org/
@@ -11,6 +11,7 @@ BuildRequires:  zlib-devel, cmake
 Patch0:         %{name}-norpath.patch
 Patch1:         %{name}-python3.patch
 Patch2:		%{name}-1.3.9-cmake.patch
+Patch3:         %{name}-1.3.9-errgetfunc.patch
 
 %description
 The serf library is a C-based HTTP client library built upon the Apache 
@@ -58,6 +59,9 @@ rm -rf %{buildroot}%{_datadir}
 %{_libdir}/pkgconfig/serf*.pc
 
 %changelog
+* Mon Aug  9 2021 Joe Orton <jorton@redhat.com> - 1.3.9-24
+- fix FTBFS with OpenSSL 3.0 beta 2 (#1991008)
+
 * Wed Jun 30 2021 Tomas Korbar <tkorbar@redhat.com> - 1.3.9-23
 - Fix soname problems
 - Related: rhbz#1974621