add new package : erlang (#14548)

var/spack/repos/builtin/packages/erlang/package.py

+# Copyright 2013-2020 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+from spack import *
+
+
+class Erlang(AutotoolsPackage):
+    """
+    Erlang is a programming language and runtime system for building
+    massively scalable soft real-time systems with requirements on
+    high availability.
+    """
+
+    homepage = "https://erlang.org/"
+    url      = "https://erlang.org/download/otp_src_22.2.tar.gz"
+
+    version('22.2', sha256='89c2480cdac566065577c82704a48e10f89cf2e6ca5ab99e1cf80027784c678f')
+    version('22.1', sha256='cd33a102cbac6dd1c7b1e7a9a0d82d13587771fac4e96e8fff92e403d15e32c8')
+    version('22.0', sha256='042e168d74055a501c75911694758a30597446accd8c82ec569552b9e9fcd272')
+    version('21.3', sha256='69a743c4f23b2243e06170b1937558122142e47c8ebe652be143199bfafad6e4')
+    version('21.2', sha256='f6b07bf8e6705915679a63363ce80faaa6b7c231e7236cde443d6445f7430334')
+
+    depends_on('autoconf', type='build')
+    depends_on('automake', type='build')
+    depends_on('m4', type='build')
+    depends_on('libtool', type='build')