net/quagga: take maintainership and undeprecate

With years, Quagga got decent support for FreeBSD networking stack
that is still better than one in FRRouting project tested with Linux mostly.

Quagga deals with FreeBSD implementation of IP aliases better,
its OSPF implementation is more robust etc.

I use the software and will maintain the port.

net/quagga/Makefile

@@ -4,16 +4,13 @@ PORTREVISION=	9
 CATEGORIES=	net
 MASTER_SITES=	https://github.com/Quagga/quagga/releases/download/${DISTNAME}/
 
-MAINTAINER=	ports@FreeBSD.org
+MAINTAINER=	eugen@FreeBSD.org
 COMMENT=	Free RIPv1, RIPv2, OSPFv2, BGP4, IS-IS route software
 WWW=		https://www.quagga.net/
 
 LICENSE=	GPLv2+
 LICENSE_FILE=	${WRKSRC}/COPYING
 
-DEPRECATED=	Abandonware, last release in 2018 and no development in years. Consider using net/frr* , net/bird2 or net/openbgpd*
-EXPIRATION_DATE=2023-03-31
-
 USES=		compiler:c11 cpe gmake libtool makeinfo \
 		perl5 readline ssl