net/dante: try to unbreak the port's build on 15-CURRENT (+)

- Due to the way this code wraps around some standard library's
  functions, it cannot be compiled with -D_FORTIFY_SOURCE=2, so
  disable the naive check in the configure script
- Optionize UPnP support and remove SASL dependency for now as
  it does nothing alone; it could be introduced later together
  with proper LDAP support

Reported by:	pkg-fallout

net/dante/Makefile

@@ -12,12 +12,8 @@ WWW=		https://www.inet.no/dante/
 LICENSE=	BSD4CLAUSE
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
-LIB_DEPENDS=	libminiupnpc.so:net/miniupnpc \
-		libsasl2.so:security/cyrus-sasl2
-
-USES=		libtool localbase
+USES=		libtool localbase ssl
 GNU_CONFIGURE=	yes
-GNU_CONFIGURE_MANPREFIX=	${PREFIX}/share
 CONFIGURE_ARGS=	--with-socks-conf=${PREFIX}/etc/socks.conf \
 		--with-sockd-conf=${PREFIX}/etc/sockd.conf
 INSTALL_TARGET=	install-strip
@@ -25,7 +21,15 @@ USE_LDCONFIG=	yes
 
 USE_RC_SUBR=	sockd
 
-OPTIONS_DEFINE=	DOCS EXAMPLES
+OPTIONS_DEFINE=	DOCS EXAMPLES UPNP
+OPTIONS_DEFAULT=	UPNP
+
+UPNP_LIB_DEPENDS=	libminiupnpc.so:net/miniupnpc
+UPNP_CONFIGURE_OFF=	--without-upnp
+
+post-patch:
+	@${REINPLACE_CMD} -e '/FORTIFY_SOURCE gives error/,+28d' \
+		${WRKSRC}/configure
 
 post-install:
 .for x in s d