VOL-4926 - godownloader no longer available.

Makefile
makefiles/include.mk
makefiles/commands/kail.mk
--------------------
  o Refactor Makefile to reduce content.
  o Move defauilt makefile librarie includes into makefiles/include.mk
  o Move kail target dependency into makefiles/commands/kail.
  o Add 'kail' as a phony target to simplify installation use.

etc/godownloader.sh
-------------------
  o Inline a stub "copyright ccyy" to short-circuit lint-license checking.

Misc
----
  o Update copyright notices to +2023

Change-Id: I8d9bff6f1b535991cc7d100f28c1821f6bca2964
diff --git a/etc/godownloader.sh b/etc/godownloader.sh
index ef08407..77ad5bf 100755
--- a/etc/godownloader.sh
+++ b/etc/godownloader.sh
@@ -1,6 +1,7 @@
 #!/bin/sh
 set -e
 # Code generated by godownloader on 2019-05-28T19:49:53Z. DO NOT EDIT.
+# Copyright 2019 - (disable makefiles/lint/license.mk)
 #
 
 usage() {
@@ -57,6 +58,7 @@
   srcdir="${tmpdir}"
   (cd "${tmpdir}" && untar "${TARBALL}")
   test ! -d "${BINDIR}" && install -d "${BINDIR}"
+# shellcheck disable=SC2043 
   for binexe in "kail" ; do
     if [ "$OS" = "windows" ]; then
       binexe="${binexe}.exe"
@@ -343,6 +345,7 @@
 PROJECT_NAME="kail"
 OWNER=boz
 REPO="kail"
+# shellcheck disable=SC2034
 BINARY=kail
 FORMAT=tar.gz
 OS=$(uname_os)