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diff --git a/vendor/icu/src/ucln.h b/vendor/icu/src/ucln.h
deleted file mode 100644
index 05987886e2..0000000000
--- a/vendor/icu/src/ucln.h
+++ /dev/null
@@ -1,91 +0,0 @@
-// © 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