workarounds: remove *.in-addr.arpa.net NO_0X20 workarrounds

The Internet has changed, turktel ones are fixed, edatel one does not
work at all.

modules/workarounds/workarounds.lua

@@ -19,36 +19,5 @@ function M.config()
 	}))
 end
 
--- Issue #139: When asking certain nameservers for PTR, disable 0x20.
--- Just listing the *.in-addr.arpa suffixes would be tedious, as there are many.
-M.layer = {
-	produce = function (state, req)
-		local qry = req:current()
-		if qry.stype ~= kres.type.PTR
-			or bit.band(state, bit.bor(kres.FAIL, kres.DONE)) ~= 0
-			then return state -- quick exit in most cases
-		end
-		if qry.flags.AWAIT_CUT or qry.ns.name == nil
-			then return state end
-		local name = kres.dname2str(qry.ns.name)
-		if not name then return state end
-
-		-- The problematic nameservers:
-		-- (1) rdnsN.turktelekom.com.tr.
-		if string.sub(name, 6) == '.turktelekom.com.tr.' then
-			qry.flags.NO_0X20 = true
-			qry.flags.NO_MINIMIZE = true
-			-- ^ NO_MINIMIZE isn't required for success, as kresd will retry
-			-- after getting refused, but it will speed things up.
-
-		-- (2)
-		elseif name == 'dns1.edatel.net.co.' then
-			qry.flags.NO_0X20 = true
-		end
-
-		return state
-	end,
-}
-
 return M