_9pfs: add license + homepage

pkgs/tools/filesystems/9pfs/default.nix

···
   enableParallelBuilding = true;
 
   meta = {
-    #homepage = https://github.com/spewspew/9pfs; # the account apparently doesn't exist
+    homepage = https://github.com/mischief/9pfs;
     description = "FUSE-based client of the 9P network filesystem protocol";
     maintainers = [ lib.maintainers.eelco ];
     platforms = lib.platforms.linux;
+    license = with lib.licenses; [ lpl-102 bsd2 ];
   };
 }