Remove readline from the package.

config/patches/readline/readline-6.2-curses-link.patch

-link readline directly to ncurses since it needs symbols from it
-
-upstream readline does this on purpose (no direct linking), but
-it doesn't make much sense in a Linux world
-
---- a/support/shobj-conf
-+++ b/support/shobj-conf
-@@ -42,7 +42,7 @@
- SHOBJ_LIBS=
-
- SHLIB_XLDFLAGS=
--SHLIB_LIBS=
-+SHLIB_LIBS='-lncurses -ltinfo'
-
- SHLIB_DOT='.'
- SHLIB_LIBPREF='lib'

config/software/readline.rb

-#
-# Copyright:: Copyright (c) 2016 GitLab Inc.
-# License:: Apache License, Version 2.0
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-#
-
-name 'readline'
-default_version '6.2'
-
-# http://buildroot-busybox.2317881.n4.nabble.com/PATCH-readline-link-directly-against-ncurses-td24410.html
-# https://bugzilla.redhat.com/show_bug.cgi?id=499837
-# http://lists.osgeo.org/pipermail/grass-user/2003-September/010290.html
-# http://trac.sagemath.org/attachment/ticket/14405/readline-tinfo.diff
-dependency 'ncurses'
-
-license 'GPL-3.0'
-license_file 'COPYING'
-
-source url: "ftp://ftp.gnu.org/gnu/readline/readline-#{version}.tar.gz",
-       md5: '67948acb2ca081f23359d0256e9a271c'
-
-relative_path "#{name}-#{version}"
-
-build do
-  env = {
-    'CFLAGS' => "-I#{install_dir}/embedded/include",
-    'LDFLAGS' => "-Wl,-rpath,#{install_dir}/embedded/lib -L#{install_dir}/embedded/lib"
-  }
-
-  configure_command = [
-    './configure',
-    '--with-curses',
-    "--prefix=#{install_dir}/embedded"
-  ].join(' ')
-
-  patch source: 'readline-6.2-curses-link.patch', plevel: 1
-  command configure_command, env: env
-  make " -j #{workers}", env: env
-  make 'install', env: env
-end