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diff --git a/thirdparty/icu4c/common/ucln.h b/thirdparty/icu4c/common/ucln.h
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+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+******************************************************************************
+*
+* Copyright (C) 2001-2013, International Business Machines
+*                Corporation and others. All Rights Reserved.
+*
+******************************************************************************
+*   file name:  ucln.h
+*   encoding:   UTF-8
+*   tab size:   8 (not used)
+*   indentation:4
+*
+*   created on: 2001July05
+*   created by: George Rhoten
+*/
+
+#ifndef __UCLN_H__
+#define __UCLN_H__
+
+#include "unicode/utypes.h"
+
+/** These are the functions used to register a library's memory cleanup
+ * functions.  Each library should define a single library register function
+ * to call this API.  In the i18n library, it is ucln_i18n_registerCleanup().
+ *
+ * None of the cleanup functions should use a mutex to clean up an API's
+ * allocated memory because a cleanup function is not meant to be thread safe,
+ * and plenty of data cannot be reference counted in order to make sure that
+ * no one else needs the allocated data.
+ *
+ * In order to make a cleanup function get called when u_cleanup is called,
+ * You should add your function to the library specific cleanup function.
+ * If the cleanup function is not in the common library, the code that
+ * allocates the memory should call the library specific cleanup function.
+ * For instance, in the i18n library, any memory allocated statically must
+ * call ucln_i18n_registerCleanup() from the ucln_in.h header.  These library
+ * cleanup functions are needed in order to prevent a circular dependency
+ * between the common library and any other library.
+ *
+ * The order of the cleanup is very important.  In general, an API that
+ * depends on a second API should be cleaned up before the second API.
+ * For instance, the default converter in ustring depends upon the converter
+ * API.  So the default converter should be closed before the converter API
+ * has its cache flushed.  This will prevent any memory leaks due to
+ * reference counting.
+ *
+ * Please see common/ucln_cmn.{h,c} and i18n/ucln_in.{h,c} for examples.
+ */
+
+/**
+ * Data Type for cleanup function selector. These roughly correspond to libraries.
+ */
+typedef enum ECleanupLibraryType {
+    UCLN_START = -1,
+    UCLN_UPLUG,     /* ICU plugins */
+    UCLN_CUSTOM,    /* Custom is for anyone else. */
+    UCLN_CTESTFW,
+    UCLN_TOOLUTIL,
+    UCLN_LAYOUTEX,
+    UCLN_LAYOUT,
+    UCLN_IO,
+    UCLN_I18N,
+    UCLN_COMMON /* This must be the last one to cleanup. */
+} ECleanupLibraryType;
+
+/**
+ * Data type for cleanup function pointer
+ */
+U_CDECL_BEGIN
+typedef UBool U_CALLCONV cleanupFunc(void);
+typedef void U_CALLCONV initFunc(UErrorCode *);
+U_CDECL_END
+
+/**
+ * Register a cleanup function
+ * @param type which library to register for.
+ * @param func the function pointer
+ */
+U_CAPI void U_EXPORT2 ucln_registerCleanup(ECleanupLibraryType type,
+                                           cleanupFunc *func);
+
+/**
+ * Request cleanup for one specific library.
+ * Not thread safe.
+ * @param type which library to cleanup
+ */
+U_CAPI void U_EXPORT2 ucln_cleanupOne(ECleanupLibraryType type);
+
+#endif