make /adm group writable

Reference: /n/atom/patch/applied/admgroup
Date: Mon Jun 23 13:19:26 CES 2014
Signed-off-by: quanstro@quanstro.net

--- /sys/lib/dist/amd64/proto/fullsys	Mon Jun 23 13:19:21 2014
+++ /sys/lib/dist/amd64/proto/fullsys	Mon Jun 23 13:19:22 2014
@@ -2,7 +2,7 @@
 # arches are included elsewhere
 acme
 	+	-	sys	sys
-adm	d755	sys	sys
+adm	d775	sys	sys
 	cache	-	adm	adm
 	keys	660	adm	adm
 	keys.who 660	adm	adm