Move all external code to lib/external.

lib/fetch/errlist.sh

@@ -1,11 +0,0 @@
-#!/bin/sh
-# $NetBSD: errlist.sh,v 1.2 2008/10/06 12:58:29 joerg Exp $
-
-printf "static struct fetcherr $1[] = {\n"
-while read code type msg; do
-	[ "${code}" = "#" ] && continue
-	printf "\t{ ${code}, FETCH_${type}, \"${msg}\" },\n"
-done < $3
-
-printf "\t{ -1, FETCH_UNKNOWN, \"Unknown $2 error\" }\n"
-printf "};\n"