net-mgmt/net-snmp: Fix asterisk build

Always install IPv6 headers, regardless of IPv6 OPTION
PR:		264749

net-mgmt/net-snmp/Makefile

@@ -2,6 +2,7 @@
 
 PORTNAME=	snmp
 PORTVERSION=	5.9.1
+PORTREVISION=	1
 PORTEPOCH=	1
 CATEGORIES=	net-mgmt
 MASTER_SITES=	SF/net-${PORTNAME}/net-${PORTNAME}/${PORTVERSION} \

net-mgmt/net-snmp/pkg-plist

@@ -129,11 +129,11 @@ include/net-snmp/library/snmpCallbackDomain.h
 %%TLS%%include/net-snmp/library/snmpDTLSUDPDomain.h
 include/net-snmp/library/snmpIPBaseDomain.h
 include/net-snmp/library/snmpTCPDomain.h
-%%WITH_IPV6%%include/net-snmp/library/snmpTCPIPv6Domain.h
+include/net-snmp/library/snmpTCPIPv6Domain.h
 %%TLS%%include/net-snmp/library/snmpTLSBaseDomain.h
 %%TLS%%include/net-snmp/library/snmpTLSTCPDomain.h
 include/net-snmp/library/snmpUDPDomain.h
-%%WITH_IPV6%%include/net-snmp/library/snmpUDPIPv6Domain.h
+include/net-snmp/library/snmpUDPIPv6Domain.h
 include/net-snmp/library/snmpUnixDomain.h
 include/net-snmp/library/snmp_alarm.h
 include/net-snmp/library/snmp_api.h
@@ -151,7 +151,7 @@ include/net-snmp/library/snmp_transport.h
 include/net-snmp/library/snmpusm.h
 include/net-snmp/library/snmpv3-security-includes.h
 include/net-snmp/library/snmpv3.h
-%%WITH_IPV6%%include/net-snmp/library/snmpIPv6BaseDomain.h
+include/net-snmp/library/snmpIPv6BaseDomain.h
 include/net-snmp/library/snmpUDPBaseDomain.h
 include/net-snmp/library/snmpUDPIPv4BaseDomain.h
 include/net-snmp/library/snmpTCPBaseDomain.h