net/rdist6: Rename the binary from rdist6 to rdist

Years ago FreeBSD base had its own /usr/bin/rdist. To avoid confusion
and allow users to use rdist6 without PATH or alias gymnastics the
binary was renamed to rdist6. FreeBSD no longer maintains its own
rdist so we can revert back from rdist6 to rdist ourselves.

net/rdist6/Makefile

@@ -1,6 +1,6 @@
 PORTNAME=	rdist
 PORTVERSION=	6.1.5
-PORTREVISION=	8
+PORTREVISION=	9
 CATEGORIES=	net
 MASTER_SITES=	https://fossies.org/linux/misc/old/ \
 		http://www.magnicomp.com/download/rdist/
@@ -11,8 +11,11 @@ WWW=		https://www.magnicomp.com/
 
 MAKE_JOBS_UNSAFE=	yes
 
-# To avoid confusion with /usr/bin/rdist, you may prefer otherwise.
-RDIST_NAME?=	rdist6
+# Years ago base FreeBSD maintained /usr/bin/rdist, but since then it was
+# removed. Users who wish to continue to use the rdist6 name can set
+# RDIST_NAME=rdist6 in their make.conf. Otherwise we install binary named
+# rdist.
+RDIST_NAME?=	rdist
 
 INSTALL_TARGET=	install install.man
 MAKE_ENV=	BUILD_OPT="${CFLAGS}" BUILD_CLIENT=${RDIST_NAME} \