create perl-file-which package (#6800)

* create perl-file-which package

* trivial edits for package.py so

trivial edits for package.py so that flake8 will not complain

var/spack/repos/builtin/packages/perl-file-which/package.py

@@ -0,0 +1,34 @@
+##############################################################################
+# Copyright (c) 2013-2017, Lawrence Livermore National Security, LLC.
+# Produced at the Lawrence Livermore National Laboratory.
+#
+# This file is part of Spack.
+# Created by Todd Gamblin, tgamblin@llnl.gov, All rights reserved.
+# LLNL-CODE-647188
+#
+# For details, see https://github.com/spack/spack
+# Please also see the NOTICE and LICENSE files for our notice and the LGPL.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License (as
+# published by the Free Software Foundation) version 2.1, February 1999.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the IMPLIED WARRANTY OF
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the terms and
+# conditions of the GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+##############################################################################
+from spack import *
+
+
+class PerlFileWhich(PerlPackage):
+    """Perl implementation of the which utility as an API"""
+
+    homepage = "http://cpansearch.perl.org/src/PLICEASE/File-Which-1.22/lib/File/Which.pm"
+    url      = "http://search.cpan.org/CPAN/authors/id/P/PL/PLICEASE/File-Which-1.22.tar.gz"
+
+    version('1.22', 'face60fafd220dc83fa581ef6f96d480')