Add new package: libopts (#18836)

* Add new package: libopts

* fix flake8 error

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

@@ -0,0 +1,21 @@
+# 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 Libopts(AutotoolsPackage):
+    """LibOPT is an optimization library developed in C language for the
+    development of metaheuristic-based techniques."""
+
+    homepage = "https://github.com/jppbsi/LibOPT/"
+    git      = "https://github.com/jppbsi/LibOPT.git"
+
+    version('master', branch='master')
+
+    parallel = False
+
+    def install(self, spec, prefix):
+        install_tree('lib', prefix.lib)