Move ICU headers from public/{common,i18n} to source/{common,i18n}

public/common/unicode/utf32.h

Index: public/common/unicode/utf32.h
diff --git a/public/common/unicode/utf32.h b/public/common/unicode/utf32.h
deleted file mode 100644
index bf63e69dba00c79e74048f5655dc81c6698cec1a..0000000000000000000000000000000000000000
--- a/public/common/unicode/utf32.h
+++ /dev/null
@@ -1,23 +0,0 @@
-/*
-*******************************************************************************
-*
-*   Copyright (C) 1999-2001, International Business Machines
-*   Corporation and others.  All Rights Reserved.
-*
-*******************************************************************************
-*   file name:  utf32.h
-*   encoding:   US-ASCII
-*   tab size:   8 (not used)
-*   indentation:4
-*
-*   created on: 1999sep20
-*   created by: Markus W. Scherer
-*/
-/**
- * \file
- * \brief C API: UTF-32 macros
- *
- * This file is obsolete and its contents moved to utf_old.h.
- * See utf_old.h and Jitterbug 2150 and its discussion on the ICU mailing list
- * in September 2002.
- */