package/syslog-ng: fix libressl build

Fix the following build failure with libressl raised since bump to
version 3.37.1 in commit 2546a31ccef6fed6c3bd40d6a1f13f4d0898cea9 and
https://github.com/syslog-ng/syslog-ng/commit/c7ba645918480da06b9e065c62ebd630312b0c7f:

/nvmedata/autobuild/instance-5/output-1/host/lib/gcc/nios2-buildroot-linux-gnu/10.3.0/../../../../nios2-buildroot-linux-gnu/bin/ld: ./lib/.libs/libsyslog-ng.so: undefined reference to `SSL_CTX_set1_client_sigalgs_list'
/nvmedata/autobuild/instance-5/output-1/host/lib/gcc/nios2-buildroot-linux-gnu/10.3.0/../../../../nios2-buildroot-linux-gnu/bin/ld: ./lib/.libs/libsyslog-ng.so: undefined reference to `SSL_CTX_set1_sigalgs_list'

Fixes:
 - http://autobuild.buildroot.org/results/84cf9f6a0f6de831a685b73c42eab868952c8b15

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/syslog-ng/0002-lib-tlscontext.c-fix-libressl-build.patch

@@ -0,0 +1,85 @@
+From 6f93484cea81ff8d45df213d5d2b4cffc4eadcad Mon Sep 17 00:00:00 2001
+From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+Date: Sat, 16 Jul 2022 18:09:25 +0200
+Subject: [PATCH] lib/tlscontext.c: fix libressl build
+
+Fix the following build failure with libressl raised since version
+3.37.1 and
+https://github.com/syslog-ng/syslog-ng/commit/c7ba645918480da06b9e065c62ebd630312b0c7f:
+
+/nvmedata/autobuild/instance-5/output-1/host/lib/gcc/nios2-buildroot-linux-gnu/10.3.0/../../../../nios2-buildroot-linux-gnu/bin/ld: ./lib/.libs/libsyslog-ng.so: undefined reference to `SSL_CTX_set1_client_sigalgs_list'
+/nvmedata/autobuild/instance-5/output-1/host/lib/gcc/nios2-buildroot-linux-gnu/10.3.0/../../../../nios2-buildroot-linux-gnu/bin/ld: ./lib/.libs/libsyslog-ng.so: undefined reference to `SSL_CTX_set1_sigalgs_list'
+
+Fixes:
+ - http://autobuild.buildroot.org/results/84cf9f6a0f6de831a685b73c42eab868952c8b15
+
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+[Upstream status: https://github.com/syslog-ng/syslog-ng/pull/4081]
+---
+ cmake/openssl_functions.cmake | 4 +++-
+ configure.ac                  | 2 ++
+ lib/tlscontext.c              | 4 ++++
+ syslog-ng-config.h.in         | 2 ++
+ 4 files changed, 11 insertions(+), 1 deletion(-)
+
+diff --git a/cmake/openssl_functions.cmake b/cmake/openssl_functions.cmake
+index afd7b96bfe..319dcc2e23 100644
+--- a/cmake/openssl_functions.cmake
++++ b/cmake/openssl_functions.cmake
+@@ -42,7 +42,9 @@ function (openssl_set_defines)
+     DH_set0_pqg
+     BN_get_rfc3526_prime_2048
+     SSL_CTX_set_num_tickets
+-    SSL_CTX_set_ciphersuites)
++    SSL_CTX_set_ciphersuites
++    SSL_CTX_set1_sigalgs_list
++    SSL_CTX_set1_client_sigalgs_list)
+ 
+   foreach (symbol ${symbol_list})
+     string(TOUPPER ${symbol} SYMBOL_UPPERCASE)
+diff --git a/configure.ac b/configure.ac
+index 8cfab2251e..ecffb84f06 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -1055,6 +1055,8 @@ AC_CHECK_DECLS([ASN1_STRING_get0_data], [], [], [[#include <openssl/asn1.h>]])
+ AC_CHECK_DECLS([DH_set0_pqg], [], [], [[#include <openssl/dh.h>]])
+ AC_CHECK_DECLS([BN_get_rfc3526_prime_2048], [], [], [[#include <openssl/bn.h>]])
+ AC_CHECK_DECLS([SSL_CTX_set_num_tickets],[], [], [[#include <openssl/ssl.h>]])
++AC_CHECK_DECLS([SSL_CTX_set1_sigalgs_list],[], [], [[#include <openssl/ssl.h>]])
++AC_CHECK_DECLS([SSL_CTX_set1_client_sigalgs_list],[], [], [[#include <openssl/ssl.h>]])
+ 
+ CPPFLAGS="$CPPFLAGS_SAVE"
+ 
+diff --git a/lib/tlscontext.c b/lib/tlscontext.c
+index ddde21dcaf..dedcf1ce5a 100644
+--- a/lib/tlscontext.c
++++ b/lib/tlscontext.c
+@@ -598,11 +598,15 @@ tls_context_setup_cipher_suite(TLSContext *self)
+ static gboolean
+ tls_context_setup_sigalgs(TLSContext *self)
+ {
++#if SYSLOG_NG_HAVE_DECL_SSL_CTX_SET1_SIGALGS_LIST
+   if (self->sigalgs && !SSL_CTX_set1_sigalgs_list(self->ssl_ctx, self->sigalgs))
+     return FALSE;
++#endif
+ 
++#if SYSLOG_NG_HAVE_DECL_SSL_CTX_SET1_CLIENT_SIGALGS_LIST
+   if (self->client_sigalgs && !SSL_CTX_set1_client_sigalgs_list(self->ssl_ctx, self->client_sigalgs))
+     return FALSE;
++#endif
+ 
+   return TRUE;
+ }
+diff --git a/syslog-ng-config.h.in b/syslog-ng-config.h.in
+index 1817deea50..004b0a7be6 100644
+--- a/syslog-ng-config.h.in
++++ b/syslog-ng-config.h.in
+@@ -57,6 +57,8 @@
+ #cmakedefine01 SYSLOG_NG_HAVE_DECL_ASN1_STRING_GET0_DATA
+ #cmakedefine01 SYSLOG_NG_HAVE_DECL_SSL_CTX_GET0_PARAM
+ #cmakedefine01 SYSLOG_NG_HAVE_DECL_SSL_CTX_SET_CIPHERSUITES
++#cmakedefine01 SYSLOG_NG_HAVE_DECL_SSL_CTX_SET1_SIGALGS_LIST
++#cmakedefine01 SYSLOG_NG_HAVE_DECL_SSL_CTX_SET1_CLIENT_SIGALGS_LIST
+ #cmakedefine01 SYSLOG_NG_HAVE_DECL_X509_STORE_CTX_GET0_CERT
+ #cmakedefine01 SYSLOG_NG_HAVE_DECL_X509_GET_EXTENSION_FLAGS
+ #cmakedefine01 SYSLOG_NG_HAVE_DECL_DH_SET0_PQG