lang/luajit-devel: Fix bin/luajit symlink

The bin/luajit symlink dangles:
$ ls -l /usr/local/bin/luajit*
lrwxr-xr-x  1 root  wheel      21 Oct 14 11:33 /usr/local/bin/luajit -> luajit-2.1.0.20221004
-rwxr-xr-x  1 root  wheel  633096 Oct 14 11:33 /usr/local/bin/luajit-2.1.0-beta3

lang/luajit-devel/Makefile

 PORTNAME=	luajit
 DISTVERSION=	2.1.0.20221004
+PORTREVISION=	1
 CATEGORIES=	lang
 PKGNAMESUFFIX=	-devel
 DISTNAME=	LuaJIT-${DISTVERSION}
@@ -35,7 +36,7 @@ USE_GCC=yes
 .endif
 
 post-install:
-	${LN} -sf ${PORTNAME}-${DISTVERSION} \
+	${LN} -sf ${PORTNAME}-${LUAJIT_VERSION} \
 		${STAGEDIR}${PREFIX}/bin/${PORTNAME}
 	${INSTALL_MAN} ${WRKSRC}/etc/luajit.1 ${STAGEDIR}${MAN1PREFIX}/man/man1