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diff --git a/thirdparty/icu4c/common/uinvchar.h b/thirdparty/icu4c/common/uinvchar.h
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+++ b/thirdparty/icu4c/common/uinvchar.h
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+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+*******************************************************************************
+*
+*   Copyright (C) 1999-2015, International Business Machines
+*   Corporation and others.  All Rights Reserved.
+*
+*******************************************************************************
+*   file name:  uinvchar.h
+*   encoding:   UTF-8
+*   tab size:   8 (not used)
+*   indentation:2
+*
+*   created on: 2004sep14
+*   created by: Markus W. Scherer
+*
+*   Definitions for handling invariant characters, moved here from putil.c
+*   for better modularization.
+*/
+
+#ifndef __UINVCHAR_H__
+#define __UINVCHAR_H__
+
+#include "unicode/utypes.h"
+#ifdef __cplusplus
+#include "unicode/unistr.h"
+#endif
+
+/**
+ * Check if a char string only contains invariant characters.
+ * See utypes.h for details.
+ *
+ * @param s Input string pointer.
+ * @param length Length of the string, can be -1 if NUL-terminated.
+ * @return true if s contains only invariant characters.
+ *
+ * @internal (ICU 2.8)
+ */
+U_CAPI UBool U_EXPORT2
+uprv_isInvariantString(const char *s, int32_t length);
+
+/**
+ * Check if a Unicode string only contains invariant characters.
+ * See utypes.h for details.
+ *
+ * @param s Input string pointer.
+ * @param length Length of the string, can be -1 if NUL-terminated.
+ * @return true if s contains only invariant characters.
+ *
+ * @internal (ICU 2.8)
+ */
+U_CAPI UBool U_EXPORT2
+uprv_isInvariantUString(const UChar *s, int32_t length);
+
+/**
+ * \def U_UPPER_ORDINAL
+ * Get the ordinal number of an uppercase invariant character
+ * @internal
+ */
+#if U_CHARSET_FAMILY==U_ASCII_FAMILY
+#   define U_UPPER_ORDINAL(x) ((x)-'A')
+#elif U_CHARSET_FAMILY==U_EBCDIC_FAMILY
+#   define U_UPPER_ORDINAL(x) (((x) < 'J') ? ((x)-'A') : \
+                              (((x) < 'S') ? ((x)-'J'+9) : \
+                               ((x)-'S'+18)))
+#else
+#   error Unknown charset family!
+#endif
+
+#ifdef __cplusplus
+
+U_NAMESPACE_BEGIN
+
+/**
+ * Like U_UPPER_ORDINAL(x) but with validation.
+ * Returns 0..25 for A..Z else a value outside 0..25.
+ */
+inline int32_t uprv_upperOrdinal(int32_t c) {
+#if U_CHARSET_FAMILY==U_ASCII_FAMILY
+    return c - 'A';
+#elif U_CHARSET_FAMILY==U_EBCDIC_FAMILY
+    // EBCDIC: A-Z (26 letters) is split into three ranges A-I (9 letters), J-R (9), S-Z (8).
+    // https://en.wikipedia.org/wiki/EBCDIC_037#Codepage_layout
+    if (c <= 'I') { return c - 'A'; }  // A-I --> 0-8
+    if (c < 'J') { return -1; }
+    if (c <= 'R') { return c - 'J' + 9; }  // J-R --> 9..17
+    if (c < 'S') { return -1; }
+    return c - 'S' + 18;  // S-Z --> 18..25
+#else
+#   error Unknown charset family!
+#endif
+}
+
+// Like U_UPPER_ORDINAL(x) but for lowercase and with validation.
+// Returns 0..25 for a..z else a value outside 0..25.
+inline int32_t uprv_lowerOrdinal(int32_t c) {
+#if U_CHARSET_FAMILY==U_ASCII_FAMILY
+    return c - 'a';
+#elif U_CHARSET_FAMILY==U_EBCDIC_FAMILY
+    // EBCDIC: a-z (26 letters) is split into three ranges a-i (9 letters), j-r (9), s-z (8).
+    // https://en.wikipedia.org/wiki/EBCDIC_037#Codepage_layout
+    if (c <= 'i') { return c - 'a'; }  // a-i --> 0-8
+    if (c < 'j') { return -1; }
+    if (c <= 'r') { return c - 'j' + 9; }  // j-r --> 9..17
+    if (c < 's') { return -1; }
+    return c - 's' + 18;  // s-z --> 18..25
+#else
+#   error Unknown charset family!
+#endif
+}
+
+U_NAMESPACE_END
+
+#endif
+
+/**
+ * Returns true if c == '@' is possible.
+ * The @ sign is variant, and the @ sign used on one
+ * EBCDIC machine won't be compiled the same way on other EBCDIC based machines.
+ * @internal
+ */
+U_CFUNC UBool
+uprv_isEbcdicAtSign(char c);
+
+/**
+ * \def uprv_isAtSign
+ * Returns true if c == '@' is possible.
+ * For ASCII, checks for exactly '@'. For EBCDIC, calls uprv_isEbcdicAtSign().
+ * @internal
+ */
+#if U_CHARSET_FAMILY==U_ASCII_FAMILY
+#   define uprv_isAtSign(c) ((c)=='@')
+#elif U_CHARSET_FAMILY==U_EBCDIC_FAMILY
+#   define uprv_isAtSign(c) uprv_isEbcdicAtSign(c)
+#else
+#   error Unknown charset family!
+#endif
+
+/**
+ * Compare two EBCDIC invariant-character strings in ASCII order.
+ * @internal
+ */
+U_CAPI int32_t U_EXPORT2
+uprv_compareInvEbcdicAsAscii(const char *s1, const char *s2);
+
+/**
+ * \def uprv_compareInvCharsAsAscii
+ * Compare two invariant-character strings in ASCII order.
+ * @internal
+ */
+#if U_CHARSET_FAMILY==U_ASCII_FAMILY
+#   define uprv_compareInvCharsAsAscii(s1, s2) uprv_strcmp(s1, s2)
+#elif U_CHARSET_FAMILY==U_EBCDIC_FAMILY
+#   define uprv_compareInvCharsAsAscii(s1, s2) uprv_compareInvEbcdicAsAscii(s1, s2)
+#else
+#   error Unknown charset family!
+#endif
+
+/**
+ * Converts an EBCDIC invariant character to ASCII.
+ * @internal
+ */
+U_CAPI char U_EXPORT2
+uprv_ebcdicToAscii(char c);
+
+/**
+ * \def uprv_invCharToAscii
+ * Converts an invariant character to ASCII.
+ * @internal
+ */
+#if U_CHARSET_FAMILY==U_ASCII_FAMILY
+#   define uprv_invCharToAscii(c) (c)
+#elif U_CHARSET_FAMILY==U_EBCDIC_FAMILY
+#   define uprv_invCharToAscii(c) uprv_ebcdicToAscii(c)
+#else
+#   error Unknown charset family!
+#endif
+
+/**
+ * Converts an EBCDIC invariant character to lowercase ASCII.
+ * @internal
+ */
+U_CAPI char U_EXPORT2
+uprv_ebcdicToLowercaseAscii(char c);
+
+/**
+ * \def uprv_invCharToLowercaseAscii
+ * Converts an invariant character to lowercase ASCII.
+ * @internal
+ */
+#if U_CHARSET_FAMILY==U_ASCII_FAMILY
+#   define uprv_invCharToLowercaseAscii uprv_asciitolower
+#elif U_CHARSET_FAMILY==U_EBCDIC_FAMILY
+#   define uprv_invCharToLowercaseAscii uprv_ebcdicToLowercaseAscii
+#else
+#   error Unknown charset family!
+#endif
+
+/**
+ * Copy EBCDIC to ASCII
+ * @internal
+ * @see uprv_strncpy
+ */
+U_CAPI uint8_t* U_EXPORT2
+uprv_aestrncpy(uint8_t *dst, const uint8_t *src, int32_t n);
+
+
+/**
+ * Copy ASCII to EBCDIC
+ * @internal
+ * @see uprv_strncpy
+ */
+U_CAPI uint8_t* U_EXPORT2
+uprv_eastrncpy(uint8_t *dst, const uint8_t *src, int32_t n);
+
+
+
+#endif