FLAP: add new package (#25685)

Co-authored-by: Joe Schoonover <joe@fluidnumerics.com>

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

@@ -0,0 +1,25 @@
+# Copyright 2013-2021 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 Flap(CMakePackage):
+    """Fortran command Line Arguments Parser"""
+
+    homepage = "https://github.com/szaghi/FLAP"
+    url      = "https://github.com/szaghi/FLAP.git"
+    git      = "https://github.com/szaghi/FLAP.git"
+
+    maintainers = ['fluidnumerics-joe']
+
+    version('master', branch='master', submodules=True)
+
+    def flag_handler(self, name, flags):
+        if name in ['cflags', 'cxxflags', 'cppflags']:
+            return (None, flags, None)
+        elif name == 'fflags':
+            flags.append('-cpp')
+        return (flags, None, None)