Copy ICU4C 58 release from icu-project.org to aosp/icu58.

These files were exported from the ICU Subversion repository by running
the following command:

svn export \
  http://source.icu-project.org/repos/icu/icu/tags/release-58-1/ icu4c

Change-Id: I6eba07af4cce61d69f23b0b5ed7d6c92dbb20c51
diff --git a/icu4c/source/test/cintltst/cloctst.h b/icu4c/source/test/cintltst/cloctst.h
index 8ae243f..c9f2532 100644
--- a/icu4c/source/test/cintltst/cloctst.h
+++ b/icu4c/source/test/cintltst/cloctst.h
@@ -1,3 +1,5 @@
+// Copyright (C) 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
 /********************************************************************
  * COPYRIGHT:
  * Copyright (c) 1997-2014, International Business Machines Corporation and