Add Unicode Arphic CJK fonts

These are a couple of CJK fonts that are on most other Linux distributions
that aren't on NixOS

lib/licenses.nix

@@ -45,6 +45,11 @@ lib.mapAttrs (n: v: v // { shortName = n; }) rec {
     fullName = "Apple Public Source License 2.0";
   };
 
+  arphicpl = {
+    fullName = "Arphic Public License";
+    url = https://www.freedesktop.org/wiki/Arphic_Public_License/;
+  };
+
   artistic1 = spdx {
     spdxId = "Artistic-1.0";
     fullName = "Artistic License 1.0";