system: replace syslog-ng version via build

Next step is using a form of CORE_SYSLOGNG to select
the syslog-ng package suffix.  More testing needed.

Makefile

@@ -49,6 +49,7 @@ CORE_PYTHON?=	37
 CORE_RADVD?=	1
 CORE_SQUID?=	# empty
 CORE_SURICATA?=	# empty
+CORE_SYSLOGNG?=	3.22
 
 _FLAVOUR!=	if [ -f ${OPENSSL} ]; then ${OPENSSL} version; fi
 FLAVOUR?=	${_FLAVOUR:[1]}

Mk/defaults.mk

@@ -46,6 +46,7 @@ REPLACEMENTS=	CORE_ABI \
 		CORE_PKGVERSION \
 		CORE_PRODUCT \
 		CORE_REPOSITORY \
+		CORE_SYSLOGNG \
 		CORE_VERSION \
 		CORE_WWW
 

src/opnsense/service/templates/OPNsense/Syslog/syslog-ng.conf.in

@@ -1,4 +1,4 @@
-@version:3.22
+@version:%%CORE_SYSLOGNG%%
 @include "scl.conf"
 
 #