system: Add guix-icons to the base packages.

* gnu/system.scm (%base-packages-artwork): New variable.
(%base-packages): Add it.

gnu/system.scm

@@ -170,6 +170,7 @@
             %setuid-programs
             %sudoers-specification
             %base-packages
+            %base-packages-artwork
             %base-packages-interactive
             %base-packages-linux
             %base-packages-networking
@@ -755,6 +756,10 @@ of PROVENANCE-SERVICE-TYPE to its services."
   (list ath9k-htc-firmware
         openfwwf-firmware))
 
+(define %base-packages-artwork
+  ;; Default set of artwork packages.
+  (list guix-icons))
+
 (define %base-packages-utils
   ;; Default set of  utilities packages.
  (cons* procps psmisc which
@@ -815,6 +820,7 @@ of PROVENANCE-SERVICE-TYPE to its services."
   ;; Default set of packages globally visible.  It should include anything
   ;; required for basic administrator tasks.
   (append (list e2fsprogs)
+          %base-packages-artwork
           %base-packages-interactive
           %base-packages-linux
           %base-packages-networking