Rather than edit the nsswitch.conf file based on ${MK_NIS} == "no"

comment out the NIS _compat options by default, but leave them in
the file for the convenience of users who want to enable it.

Update the comment in the file accordingly.

Reviewed by:	ed
Approved by:	re (hrs)

etc/Makefile

@@ -256,10 +256,6 @@ distribution:
 	    ${DESTDIR}/boot/device.hints
 .endif
 .endif
-.if ${MK_NIS} == "no"
-	sed -i "" -e '/_compat:/d' -e 's/compat/files/' \
-		${DESTDIR}/etc/nsswitch.conf
-.endif
 
 distrib-dirs:
 	mtree -eU ${MTREE_FOLLOWS_SYMLINKS} -f ${.CURDIR}/mtree/BSD.root.dist -p ${DESTDIR}/

etc/nsswitch.conf

@@ -1,15 +1,23 @@
 #
-# nsswitch.conf(5) - name service switch configuration file
 # $FreeBSD$
 #
-group: compat
-group_compat: nis
+# To enable NIS the commented entries should replace their uncommented
+# equivalents.  See nsswitch.conf(5) for more information.
+#
+group: files
+#group_compat: nis
+#group: compat
+
+passwd: files
+#passwd_compat: nis
+#passwd: compat
+
+services: files
+#services_compat: nis
+#services: compat
+
 hosts: files dns
 networks: files
-passwd: compat
-passwd_compat: nis
 shells: files
-services: compat
-services_compat: nis
 protocols: files
 rpc: files