deps: update ICU to 64.2

Update the version of the bundled ICU (deps/icu-small) to ICU version
64.2 (Unicode 12, CLDR 35)

Fixes: https://github.com/nodejs/node/issues/26388

PR-URL: https://github.com/nodejs/node/pull/27361
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Steven R Loomis <srloomis@us.ibm.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>

1 files changed, 17 insertions, 1 deletions

diff --git a/deps/icu-small/source/common/putilimp.h b/deps/icu-small/source/common/putilimp.h
index f744746b1f..f9c13d8e1b 100644
--- a/deps/icu-small/source/common/putilimp.h
+++ b/deps/icu-small/source/common/putilimp.h
@@ -204,7 +204,7 @@ typedef size_t uintptr_t;
 
 /**
  * \def U_HAVE_STD_ATOMICS
- * Defines whether to use the standard C++11 <atomic> functions
+ * Defines whether to use the C++11 std::atomic functions.
  * If false, ICU will fall back to compiler or platform specific alternatives.
  * Note: support for these fall back options for atomics will be removed in a future version
  *       of ICU, and the use of C++ 11 atomics will be required.
@@ -232,6 +232,22 @@ typedef size_t uintptr_t;
 #    define U_HAVE_CLANG_ATOMICS 0
 #endif
 
+
+/**
+ * \def U_HAVE_STD_MUTEX
+ * Defines whether to use the C++11 std::mutex functions.
+ * If false, ICU will fall back to compiler or platform specific alternatives.
+ * std::mutex is preferred, and used by default unless this setting is overridden.
+ * Note: support for other options for mutexes will be removed in a future version
+ *       of ICU, and the use of std::mutex will be required.
+ * @internal
+ */
+#ifdef U_HAVE_STD_MUTEX
+    /* Use the predefined value. */
+#else
+#    define U_HAVE_STD_MUTEX 1
+#endif
+
 /*===========================================================================*/
 /** @{ Programs used by ICU code                                             */
 /*===========================================================================*/