udev-rules: Permission changes for /dev/dri/renderD*

- Remove the uaccess tag from /dev/dri/renderD*.
- Change the owning group from video to render.
- Change default mode to 0666.
- Add an option to allow users to set the access mode for these devices at
compile time.

sysusers.d/basic.conf.in

@@ -32,6 +32,7 @@ g lp      -     -            -
 g kvm     -     -            -
 g tape    -     -            -
 g video   -     -            -
+g render  -     -            -
 
 # Default group for normal users
 g users   -     -            -