net-mgmt/metronome: Fix build with llvm16

- Utilize USES=localbase while I am here
- Pet portclippy

Approved by:	portmgr (blanket)
Sponsored by:	The FreeBSD Foundation

net-mgmt/metronome/Makefile

@@ -13,17 +13,18 @@ LICENSE_FILE=	${WRKSRC}/LICENSE
 LIB_DEPENDS=	libboost_thread.so:devel/boost-libs
 
 USES=		autoreconf:build compiler:c++11-lang eigen:3 libtool:build \
-		pathfix pkgconfig
-
+	localbase:ldflags pathfix pkgconfig
+USE_CXXSTD=	c++14
 USE_GITHUB=	yes
 GH_ACCOUNT=	ahupowerdns
+USE_LDCONFIG=	yes
 
 GNU_CONFIGURE=	yes
-LDFLAGS+=	-L${LOCALBASE}/lib
-USE_LDCONFIG=	yes
-SUB_FILES=	pkg-message
+
 INSTALL_TARGET=	install-strip
 
+SUB_FILES=	pkg-message
+
 OPTIONS_DEFINE=	DOCS
 
 pre-configure: