Add package for FLCL (#19252)

* Initial cut at FLCL spackage. Works with GCC so far.

* Update spackage to list release which supports spack. Add @agaspar as a maintainer. Default unit tests to disabled when building with spack.

* Change url to 0.2.

* Nope, 0.3.

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

@@ -0,0 +1,29 @@
+# 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 Flcl(CMakePackage):
+    """API for Fortran to C++ and C++ to Fortran multi-dimensional array
+    interoperability using Kokkos."""
+
+    homepage = "https://github.com/kokkos/kokkos-fortran-interop"
+    git      = "https://github.com/kokkos/kokkos-fortran-interop.git"
+    url      = "https://github.com/kokkos/kokkos-fortran-interop/releases/download/0.3/0.3.tar.gz"
+
+    maintainers = ['womeld', 'agaspar']
+
+    version('develop', branch='develop')
+    version('0.3', sha256='0586b981b976588d8059e5bf1bf71fb5a7153ea950c7e2b562a3d812fefee56e')
+
+    depends_on('kokkos')
+    depends_on('cmake@3.17:', type='build')
+
+    def cmake_args(self):
+        args = []
+        args.append('-DBUILD_TESTING:BOOL={0}'.format(
+                    'ON' if self.run_tests else 'OFF'))
+
+        return args