New package libtlx (#15650)

* New package libtlx

* Replaced dash characters with ascii dash

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

@@ -0,0 +1,28 @@
+# 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 Libtlx(CMakePackage):
+    """ tlx is a collection of C++ helpers and extensions universally needed,
+        but not found in the STL.
+        The most important design goals and conventions are:
+        1) high modularity with as little dependencies between
+           modules as possible.
+        2) attempt to never break existing interfaces.
+        3) compile on all platforms with C++ - smartphones, supercomputers,
+           windows, etc.
+        4) zero external dependencies: no additional libraries are required.
+        5) warning and bug-freeness on all compilers.
+        6) keep overhead down - small overall size such that is can be included
+           without bloating applications."""
+
+    homepage = "https://tlx.github.io/"
+    url      = "https://github.com/tlx/tlx/archive/v0.5.20191212.tar.gz"
+
+    maintainers = ['fabratu']
+
+    version('0.5.20191212', sha256='5e67d3042a390dbb831b6d46437e3c7fadf738bff362aa7376b210b10ecd532d')