update api to use "block" for future protocol expantion

lib/util.lua

@@ -1,16 +1,9 @@
-local std = require("lib.std")
-local symbol = require("lib.symbol")
-
 local M = {}
 
 function M.cc(tbl, sep)
 	return table.concat(tbl, sep or "")
 end
 
-function M.copyright(link, holder)
-	return symbol.legal.copyright .. " " .. std.external(link, holder)
-end
-
 function M.ls(dir)
 	local p = io.popen('ls -A -1 -- ' .. string.format('%q', dir))
 	if not p then