math/apron: Fix build with llvm16

- Pet portclippy

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

math/apron/Makefile

@@ -20,14 +20,14 @@ LIB_DEPENDS=	libgmp.so:math/gmp \
 		libppl.so:devel/ppl
 
 USES=		gmake localbase:ldflags
+USE_CXXSTD=	c++14
+USE_GITHUB=	yes
+GH_ACCOUNT=	antoinemine
 USE_LDCONFIG=	yes
 
 HAS_CONFIGURE=	yes
 CONFIGURE_ARGS=	-prefix ${STAGEDIR}${PREFIX} -no-ocaml -no-java
 
-USE_GITHUB=	yes
-GH_ACCOUNT=	antoinemine
-
 post-stage:
 	  @${STRIP_CMD} \
 	  	${STAGEDIR}${LOCALBASE}/bin/* \