devel/ppl: Fix build with llvm16

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

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

devel/ppl/Makefile

@@ -15,8 +15,11 @@ BUILD_DEPENDS=	gm4:devel/m4
 LIB_DEPENDS=	libglpk.so:math/glpk \
 		libgmp.so:math/gmp
 
-USES=		gmake perl5 tar:xz libtool
+USES=		gmake perl5 tar:xz libtool localbase:ldflags
+USE_CXXSTD=	c++14
+USE_LDCONFIG=	yes
 USE_PERL5=	build
+
 GNU_CONFIGURE=	yes
 CONFIGURE_ARGS=	--disable-debugging \
 		--enable-optimization \
@@ -27,10 +30,6 @@ CONFIGURE_ARGS=	--disable-debugging \
 		--with-gmp-lib="${LOCALBASE}/lib" \
 		--enable-interfaces="${INTERFACES}"
 INSTALL_TARGET=	install-strip
-USE_LDCONFIG=	yes
-
-CPPFLAGS+=	-I${LOCALBASE}/include
-LDFLAGS+=	-L${LOCALBASE}/lib
 
 PORTDOCS=	*