dhcpcd: /etc/dhcpcd.conf: enable controlgroup by default.

- Users in the wheel group will be able to control dhcpcd via dhcpcd-ui.

srcpkgs/dhcpcd/template

@@ -1,7 +1,7 @@
 # Template file for 'dhcpcd'
 pkgname=dhcpcd
 version=6.6.6
-revision=1
+revision=2
 lib32disabled=yes
 build_options="systemd"
 build_style=configure
@@ -27,4 +27,6 @@ post_install() {
 	fi
 	vsv dhcpcd
 	vsv dhcpcd-eth0
+	# Enable controlgroup by default, to make dhcpcd-ui work.
+	sed -i 's,^#\(controlgroup.*\),\1,' ${DESTDIR}/etc/dhcpcd.conf
 }