Squashed 'third_party/boostorg/mpl/' content from commit 270f33f

Change-Id: I5a6782ce88b854b0fd4d374f7ada8fc18608d79a
git-subtree-dir: third_party/boostorg/mpl
git-subtree-split: 270f33f67998ffaac6afdae25fe06be2ee744d6e
diff --git a/Jamfile b/Jamfile
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+#  Boost.MPL Library Jamfile
+#
+#  Copyright (c) 2018 James E. King III
+#
+#  Use, modification, and distribution are subject to the
+#  Boost Software License, Version 1.0. (See accompanying file
+#  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+# please order by name to ease maintenance
+build-project example ;
+build-project test ;